| 交 | こもごも | alternately; in succession | |
| 交通 | こうつう | traffic; transportation; communication; exchange (of ideas, etc.) | n3 |
| 交渉 | こうしょう | negotiations; bargaining; discussions; talks | n2 |
| 交換 | こうかん | exchange; interchange; switching; reciprocity | n3 |
| 交際 | こうさい | company; friendship; association; society | n1 |
| 交う | かう | to pass each other; to brush past each other; to mingle together | n1 |
| 交える | まじえる | to mix; to combine; to include; to exchange (words, fire, etc.) | n1 |
| 交す | かわす | to exchange (messages, greetings, arguments, etc.); to intersect; to cross; to interlace | n2 |
| 交流 | こうりゅう | exchange (e.g. cultural); interchange; interaction; mingling | n3 |
| 外交 | がいこう | diplomacy; selling (e.g. door-to-door); canvassing | n1 |
| 社交 | しゃこう | social life; social intercourse | n1 |
| 交わす | かわす | to exchange (messages, greetings, arguments, etc.); to intersect; to cross; to interlace | n2 |
| 交代 | こうたい | change; alternation; rotation; replacement | n2 |
| 交錯 | こうさく | mixture; blending; complication; crossing | n1 |
| 交ぜる | まぜる | to mix; to stir; to blend | n3 |
| 交番 | こうばん | police box; koban; small neighborhood police station; alternation | n5 |
| 交叉 | こうさ | crossing; intersection; (genetic) crossing over | |
| 交わる | まじわる | to cross; to intersect; to join; to meet | |
| 交互 | こうご | alternate; alternating | n1 |
| 交じる | まじる | to be mixed; to be blended with; to be combined; to associate with | n2 |
| 交替 | こうたい | change; alternation; rotation; replacement | n2 |
| 没交渉 | ぼっこうしょう | lack of relation (to); independence (of) | |
| 絶交 | ぜっこう | breaking off a relationship; permanent breach of friendship; rupture | n1 |
| 交友 | こうゆう | friend; companion; acquaintance; friendship | |
| 交わり | まじわり | acquaintance; relations; fellowship; sexual intercourse | |
| 親交 | しんこう | intimacy; friendship; friendly relations | n1 |
| 飛び交う | とびかう | to fly about; to flutter about; to flit about; to fly past each other | n1 |
| 交易 | こうえき | trade; commerce | n1 |
| 交響楽 | こうきょうがく | symphonic music; symphony | |
| 交付 | こうふ | delivery; issuance; handing over; granting | n1 |
| 行き交う | ゆきかう | to come and go; to go back and forth | n1 |
| 交情 | こうじょう | intimacy; friendship | n4 |
| 交響 | こうきょう | reverberation | n3 |
| 交遊 | こうゆう | friendship; companionship; fraternity; comradeship | |
| 交流会 | こうりゅうかい | gathering; mixer; meetup; assembly | |
| 交戦 | こうせん | war; battle; hostilities | |
| 交差 | こうさ | crossing; intersection; (genetic) crossing over | |
| 交響曲 | こうきょうきょく | symphony | |
| 取交す | とりかわす | to exchange; to interchange | n1 |
| 交互に | こうごに | alternately; by turns; one after the other | |
| 交誼 | こうぎ | friendship; amity | n3 |
| 交尾 | こうび | copulation (among animals); mating; treading; covering | |
| 情交 | じょうこう | sexual intercourse; sexual liaison; intimacy | |
| 交差点 | こうさてん | crossing; intersection | n5 |
| 言い交す | いいかわす | to have a chat with; to exchange words or promises; to promise; to get engaged | |
| 交歓 | こうかん | exchange of courtesies (cordialities); fraternization; fraternisation | n3 |
| 国交 | こっこう | diplomatic relations | |
| 交配 | こうはい | mating; crossbreeding; cross-fertilization; cross-fertilisation | n1 |
| 交感 | こうかん | rapport; mutual sympathy | n3 |
| 交通費 | こうつうひ | traveling expenses; travelling expenses; carfare | n3 |
| 見交わす | みかわす | to exchange glances | |
| 取り交わす | とりかわす | to exchange; to interchange | n1 |
| 交感神経 | こうかんしんけい | sympathetic nerve | |
| 入交 | いりまじり | mixing with; being mixed | |
| 旧交 | きゅうこう | old friendship | n3 |
| 性交 | せいこう | sexual intercourse; sex; coitus | n4 |
| 行交う | ゆきかう | to come and go; to go back and forth | n1 |
| 手交 | しゅこう | handing over; delivery (by hand) | n1 |
| 交趾 | コーチン | Cochin (breed of chicken) | |
| 混交 | こんこう | mixture; intermixture; mixing up; jumbling together | |
| 酌み交わす | くみかわす | to pour drinks for each other; to drink together | |
| 入り交じる | いりまじる | to mix (with); to be mixed (together); to be mingled | n2 |
| 参覲交代 | さんきんこうたい | daimyo's alternating Edo residence; official attendance service (by a daimyo in the Edo period) | |
| 物々交換 | ぶつぶつこうかん | barter; bartering | |
| 交通局 | こうつうきょく | traffic bureau; transportation bureau | |
| 交合 | こうごう | sexual union; congress | |
| 交雑 | こうざつ | hybridization; crossing; mixing | |
| 参勤交代 | さんきんこうたい | daimyo's alternating Edo residence; official attendance service (by a daimyo in the Edo period) | |
| 副交感神経 | ふくこうかんしんけい | parasympathetic nerve | |
| 酌み交す | くみかわす | to pour drinks for each other; to drink together | |
| 交接 | こうせつ | sexual intercourse; copulation; mating | |
| 交流戦 | こうりゅうせん | exhibition game; friendly match; friendly; interleague game between the Central and Pacific baseball leagues | |
| 交付金 | こうふきん | subsidy; grant; bounty | |
| 交驩 | こうかん | exchange of courtesies (cordialities); fraternization; fraternisation | n3 |
| 交点 | こうてん | point of intersection | |
| 羽交締め | はがいじめ | full nelson | |
| 交ざる | まざる | to be mixed; to be blended with; to associate with; to mingle with | n2 |
| 言い交わす | いいかわす | to have a chat with; to exchange words or promises; to promise; to get engaged | |
| 目交ぜ | めまぜ | winking | |
| 斜交い | はすかい | aslant; oblique; diagonal; askew | |
| 社交的 | しゃこうてき | sociable | |
| 交通事故 | こうつうじこ | traffic accident | n3 |
| 交信 | こうしん | telecommunications; correspondence | n2 |
| 交霊 | こうれい | summoning spirits; calling down spirits; spirit evocation; communing with spirits | n1 |
| 通交 | つうこう | friendly relations | n3 |
| 交通法 | こうつうほう | traffic laws | |
| 綯い交ぜる | ないまぜる | to twist (threads of different colours) together (into a string); to entwine; to interweave; to mix | |
| 交織 | こうしょく | mixed weave | |
| 交通量 | こうつうりょう | traffic; traffic volume | |
| 交雑種 | こうざつしゅ | hybrid; crossbreed; cross | |
| 修交 | しゅうこう | amity; friendship | |
| 直交 | ちょっこう | orthogonal | |
| 肉交 | にくこう | sexual intercourse | |
| 国土交通省 | こくどこうつうしょう | Ministry of Land, Infrastructure, Transport and Tourism; MLIT | |
| 交る | まじる | to be mixed; to be blended with; to be combined; to associate with | n2 |
| 交換型 | こうかんがた | switched | |
| 交渉役 | こうしょうやく | negotiator; deal-maker | |
| 交通網 | こうつうもう | transportation network; transport network; traffic network | |
| 外交官 | がいこうかん | diplomat | |
| 再交付 | さいこうふ | reissue; regrant | |