| 何故 | なぜ | why; how; for what reason | n5 |
| 故郷 | ふるさと | hometown; birthplace; native place; one's old home | n3 |
| 故に | ゆえに | therefore; consequently | n2 |
| 事故 | じこ | accident; incident; trouble; circumstances | n3 |
| 故人 | こじん | the deceased; the departed; old friend; longtime acquaintance | n3 |
| 故事 | こじ | historical event; ancient event; tradition; folklore | n1 |
| 故障 | こしょう | fault; trouble; breakdown; failure | n3 |
| 故意 | こい | intent; intention; bad faith; mens rea (guilty mind) | n1 |
| 何故か | なぜか | somehow; for some reason; without knowing why | n3 |
| 縁故 | えんこ | relation; connection; affinity | |
| 故 | ゆえ | reason; circumstances; grounds; cause | |
| 故国 | ここく | one's native land | |
| 交通事故 | こうつうじこ | traffic accident | n3 |
| 物故 | ぶっこ | death (of a person) | |
| 故事成語 | こじせいご | idiom derived from historical events or classical literature of China | |
| 故実 | こじつ | ancient practices; old customs | |
| 故意に | こいに | deliberately; intentionally; on purpose; purposely | |
| 反故 | ほご | wastepaper; scrap paper | n2 |
| 故里 | ふるさと | hometown; birthplace; native place; one's old home | n3 |
| 故老 | ころう | old person (knowledgeable about events of the distant past); elderly person; elder | |
| 世故 | せいこ | worldly affairs | |
| 故山 | こざん | one's native place | |
| 故旧 | こきゅう | old acquaintance | n3 |
| 生まれ故郷 | うまれこきょう | one's birthplace | |
| 故智 | こち | the wisdom of the ancients | |
| 故主 | こしゅ | one's former master | |
| 有職故実 | ゆうそくこじつ | studies in usages and practices of the ancient court and military households | |
| 事故車 | じこしゃ | car involved in an accident; car with an accident history | |
| 事故防止 | じこぼうし | accident prevention | |
| 事故物件 | じこぶっけん | stigmatized property; real estate where a crime, death, etc. has occurred | |
| それ故 | それゆえ | therefore; for that reason; so; because of that | n1 |
| 故紙 | こし | used paper; paper for recycling | n4 |
| 特別縁故者 | とくべつえんこしゃ | person with a special relationship (e.g. in inheritance); special relative | |
| 温故知新 | おんこちしん | developing new ideas based on study of the past; learning from the past | |
| 事故現場 | じこげんば | scene of an accident; crash site; accident scene | |
| 事故死 | じこし | accidental death | |
| 爆発事故 | ばくはつじこ | explosion accident; explosion | |
| 人身事故 | じんしんじこ | accident resulting in personal injury or death (esp. traffic, rail, etc.) | |
| 故事来歴 | こじらいれき | origin and history; particulars | |
| 死亡事故 | しぼうじこ | fatal accident; deadly accident | |
| 無事故 | むじこ | without accident | |
| 典故 | てんこ | authentic precedent | |
| 故殺 | こさつ | (voluntary) manslaughter; killing with intent | |
| 故買 | こばい | buying stolen goods; receiving | |
| 大事故 | だいじこ | serious accident; major incident | |
| 海難事故 | かいなんじこ | accident at sea; maritime accident | |
| 自動車事故 | じどうしゃじこ | car accident; automobile accident | |
| 故障者 | こしょうしゃ | injured player | |
| 故買屋 | こばいや | receiver's shop; pawnshop which knowingly buys stolen goods | |
| それ故に | それゆえに | and so; therefore; for that reason | |
| 故知 | こち | the wisdom of the ancients | |
| 温故 | おんこ | studying the past; researching history | |
| 事故時 | じこじ | (at) the time of an accident; (in) the event of an accident | |
| 墜落事故 | ついらくじこ | plane crash | |
| 故地 | こち | former residence; former land; place remembered for a connection to someone | |
| 縁故者 | えんこしゃ | related person; relative | |
| 原発事故 | げんぱつじこ | nuclear power plant accident; nuclear accident | |
| 物損事故 | ぶっそんじこ | traffic accident resulting in property damage | |
| 鉄道事故 | てつどうじこ | railroad accident | |
| 事故歴 | じこれき | history of (automobile) accidents | |
| 故意犯 | こいはん | intentional crime | |
| 故買者 | こばいしゃ | person who buys stolen goods; dealer in stolen goods; receiver; fence | |
| 故障中 | こしょうちゅう | out of order; out of service | |
| 故障率 | こしょうりつ | failure rate | |
| 物故者 | ぶっこしゃ | dead person; the deceased | |
| 保険事故 | ほけんじこ | event insured against | |
| 医療事故 | いりょうじこ | medical error | |
| 故意四球 | こいしきゅう | intentional walk; intentional base on balls; IBB | |
| 縁故採用 | えんこさいよう | employment of workers through personal connections; hiring through personal connections; nepotism | |
| 未必の故意 | みひつのこい | conscious neglect; willful negligence; wilful negligence | |
| 故い | ふるい | old; aged; ancient; antiquated | n5 |
| 事故機 | じこき | aircraft involved in an accident; crashed aircraft; distressed aircraft | |
| 何故に | なぜに | why; how | |
| 接触事故 | せっしょくじこ | minor collision; (have) a scrape (with another vehicle); fender bender | |
| 放送事故 | ほうそうじこ | TV blooper; broadcasting blunder | |
| 臨界事故 | りんかいじこ | criticality accident (in the nuclear industry) | |
| 故址 | こし | historic ruins; foundations of an ancient building | n4 |
| 何故なら | なぜなら | because; the reason is; if you want to know why | n3 |
| 故態 | こたい | former appearance; original form | n2 |
| 何故ならば | なぜならば | because; for; the reason why is ... | n2 |
| 其れ故 | それゆえ | therefore; for that reason; so; because of that | n1 |
| 変故 | へんこ | unusual event; change (for the worse); accident | |
| 故吾 | こご | one's former self | |
| 故跡 | こせき | historic spot; historic site; place of historical interest; historic remains | |
| 故蹟 | こせき | historic spot; historic site; place of historical interest; historic remains | |
| 旧故 | きゅうこ | antiquity; old acquaintance | |
| 事故る | じこる | to have an accident (esp. traffic accident); to cause an accident | |
| 事故米 | じこまい | rice contaminated by an accident | |
| 反故籠 | ほぐかご | wastebasket | |
| 反故紙 | ほごがみ | wastepaper; scrap paper | |
| 故ない | ゆえない | without a reason | |
| 故廬鯛 | コロダイ | painted sweetlips (Diagramma pictum) | |
| 故無い | ゆえない | without a reason | |
| 故障品 | こしょうひん | broken product; faulty product | |
| 故障車 | こしょうしゃ | broken-down car | |
| この故に | このゆえに | therefore; because of this; for this reason | |
| 事故原因 | じこげんいん | source, cause of an accident | |
| 事故多発 | じこたはつ | accidents frequent; accident-prone zone; accident blackspot | |
| 事故渋滞 | じこじゅうたい | congestion caused by a traffic accident | |
| 事故無し | ことゆえなし | without incident | |
| 伝送故障 | でんそうこしょう | transmission fault | |
| 何故だか | なぜだか | somehow; for some reason; without knowing why | |
| 其れ故に | それゆえに | and so; therefore; for that reason | |
| 初期故障 | しょきこしょう | initial failure | |
| 劣化故障 | れっかこしょう | degradation failure | |
| 動力故障 | どうりょくこしょう | power failure | |
| 単独事故 | たんどくじこ | single-vehicle accident; single-vehicle collision | |
| 坑内事故 | こうないじこ | mine accident | |
| 多重事故 | たじゅうじこ | multi-vehicle accident | |
| 故あって | ゆえあって | for a certain reason; owing to unavoidable circumstances | |
| 故ありげ | ゆえありげ | seeming to be with certain circumstances; seeming to be for a certain reason | |
| 故あり気 | ゆえありげ | seeming to be with certain circumstances; seeming to be for a certain reason | |
| 故実読み | こじつよみ | historic customary reading of a kanji word | |
| 故有って | ゆえあって | for a certain reason; owing to unavoidable circumstances | |
| 故郷納税 | ふるさとのうぜい | hometown tax; system in which taxpayers can choose to divert part of their residential tax to a specified local government | |
| 機械故障 | きかいこしょう | mechanical breakdown | |
| 此の故に | このゆえに | therefore; because of this; for this reason | |
| 盗品故買 | とうひんこばい | dealing in stolen goods | |
| 縁故主義 | えんこしゅぎ | nepotism | |
| 縁故募集 | えんこぼしゅう | recruiting (inviting application for) through personal connections; private (stock) offering (subscription) | |
| 縁故政治 | えんこせいじ | crony politics; nepotistic government | |
| 縁故疎開 | えんこそかい | evacuating to the homes of one's relatives in the countryside in wartime | |
| 縮退故障 | しゅくたいこしょう | stuck-at fault (chip, circuit); stack fault | |
| 自損事故 | じそんじこ | self-inflicted accident; traffic accident where injury is caused by one's own negligence; one-car accident | |
| 苛酷事故 | かこくじこ | severe accident (esp. relating to a nuclear reactor) | |
| 親戚故旧 | しんせきこきゅう | relatives and old friends | |
| 貰い事故 | もらいじこ | traffic accident for which the other side is at fault | |
| 軽い故障 | かるいこしょう | soft failure | |
| 過酷事故 | かこくじこ | severe accident (esp. relating to a nuclear reactor) | |
| 雑踏事故 | ざっとうじこ | crowd incident (e.g. crowd crush, stampede) | |
| もらい事故 | もらいじこ | traffic accident for which the other side is at fault | |
| リンク故障 | リンクこしょう | link failure | |
| 事故にあう | じこにあう | to have an accident; to meet with an accident | |
| 事故に会う | じこにあう | to have an accident; to meet with an accident | |
| 事故に遭う | じこにあう | to have an accident; to meet with an accident | |
| 反故にする | ほごにする | to throw away as useless; to scrap; to make null and void; to renege | |
| 故事つける | こじつける | to distort; to strain (an interpretation); to stretch (the meaning of a word) | |
| 故事付ける | こじつける | to distort; to strain (an interpretation); to stretch (the meaning of a word) | |
| 故人を偲ぶ | こじんをしのぶ | to think of the dead | |
| 故郷を慕う | こきょうをしたう | to pine for home | |
| 故障に強い | こしょうにつよい | fault-tolerant | |
| 然るが故に | しかるがゆえに | as such; that being so; for that reason | |
| 第二の故郷 | だいにのこきょう | one's second home; home away from home | |
| しかるが故に | しかるがゆえに | as such; that being so; for that reason | |
| エンジン故障 | エンジンこしょう | engine failure | |
| スリップ事故 | スリップじこ | (vehicle) skidding accident | |
| ポイント故障 | ポイントこしょう | points failure (railroad) | |
| 世故に長ける | せこにたける | to know much of the world | |
| 事故多発地点 | じこたはつちてん | accident-prone zone; accident blackspot | |
| 何故かいうと | なぜかというと | the reason is that ...; because | |
| 巻き込み事故 | まきこみじこ | vehicle accident involving a turn (e.g. when a car turns and hits a bicycle that was going straight); left-turn accident; right-turn accident; left-hook accident | |
| 平均故障時間 | へいきんこしょうじかん | mean time to repair; MTTR | |
| 平均故障間隔 | へいきんこしょうかんかく | mean time between failures; MTBF | |
| 故郷忘じ難し | こきょうぼうじがたし | there is no place like home; home is sweet to an exile | |
| 縁故資本主義 | えんこしほんしゅぎ | crony capitalism | |
| サンキュー事故 | サンキューじこ | traffic accident caused by a driver thanking another driver for letting him go first at a junction | |
| 何故かと言うと | なぜかというと | the reason is that ...; because | |
| 故なしとしない | ゆえなしとしない | reasonable; understandable; justified; not without reason | |
| 故無しとしない | ゆえなしとしない | reasonable; understandable; justified; not without reason | |
| 故郷に錦を飾る | こきょうににしきをかざる | to come home in triumph; to return to one's hometown in glory | |
| 故郷へ錦を飾る | こきょうへにしきをかざる | to come home in triumph; to return to one's hometown in glory | |
| 我思う故に我あり | われおもうゆえにわれあり | I think, therefore I am; cogito, ergo sum | |
| 我思う故に我在り | われおもうゆえにわれあり | I think, therefore I am; cogito, ergo sum | |
| 我思う故に我有り | われおもうゆえにわれあり | I think, therefore I am; cogito, ergo sum | |
| 自動車事故対策機構 | じどうしゃじこたいさくきこう | National Agency for Automotive Safety & Victims' Aid (NASVA) | |
| 山高きが故に貴からず | やまたかきがゆえにたっとからず | don't judge a book by its cover; a mountain is not to be honoured just because it is high | |
| チェルノブイリ原発事故 | チェルノブイリげんぱつじこ | Chernobyl disaster (April, 1986); Chernobyl nuclear power plant accident | |
| チャレンジャー爆発事故 | チャレンジャーばくはつじこ | explosion of the Space Shuttle Challenger (January 28, 1986); Space Shuttle Challenger disaster | |
| チェルノブイリ原子力発電所事故 | チェルノブイリげんしりょくはつでんしょじこ | Chernobyl disaster (April, 1986); Chernobyl nuclear power plant accident | |