| 四月 | しがつ | April; fourth month in the lunar calendar | n5 |
| 四方 | しほう | the four cardinal directions; north, east, south and west; all directions; surroundings | n1 |
| 四つ | よっつ | four; 4; four years of age; ten o'clock (in the old time system) | n5 |
| 四国 | しこく | Shikoku (smallest of the four main islands of Japan) | |
| 四角 | しかく | quadrilateral; square | n3 |
| 四 | し | four; 4 | n5 |
| 四季 | しき | the four seasons | n3 |
| 四畳半 | よじょうはん | four and a half tatami mats; four-and-a-half-mat room; small room esp. for assignations | |
| 四辺 | しへん | neighbourhood; neighborhood; vicinity; all sides | |
| 四肢 | しし | the (four) limbs; arms and legs | |
| 四方八方 | しほうはっぽう | all directions; every direction; all sides; all quarters | |
| 四囲 | しい | surroundings; circumference | |
| 四角い | しかくい | square; rectangular | n3 |
| 四半 | しはん | quarter; a fourth; square (piece of) cloth | n2 |
| 四辻 | よつつじ | crossroads; intersection; crossway; carrefour | |
| 四隅 | よすみ | four corners; four ordinal directions | |
| 四面 | しめん | four sides; all sides | n1 |
| 四隣 | しりん | whole neighborhood; whole neighbourhood; surrounding countries | |
| 四海 | しかい | the whole world; the seven seas | n3 |
| 四足 | よつあし | four-legged; four-footed; (four-legged) animal; beast | |
| 四天王 | してんのう | the Four Heavenly Kings (Dhrtarastra, Virudhaka, Virupaksa, and Vaisravana); the big four (i.e. four leaders in a given field) | |
| 四散 | しさん | scattering (in all directions) | n1 |
| 真四角 | ましかく | square | |
| 四つ角 | よつかど | four corners; crossroads; intersecting street; street corner | |
| 四半期 | しはんき | quarter (of a year) | |
| 四阿 | あずまや | arbor; arbour; bower; summer house | |
| 四角張る | しかくばる | to be square; to be angular; to be formal; to be stiff | |
| 四書 | ししょ | the Four Books (Confucian texts) | n2 |
| 四民 | しみん | the four social classes (of Edo-period Japan; samurai, farmers, artisans, merchants) | n4 |
| 四川 | しせん | Sichuan (China); Szechuan; Szechwan | n2 |
| 四つん這い | よつんばい | crawling on all fours; being on all fours; being on one's hands and knees | |
| 四人 | よにん | four people | |
| 四十雀 | しじゅうから | Japanese tit (Parus minor); Oriental tit | |
| 四苦八苦 | しくはっく | being in dire distress; being hard put to it; being hard pressed (for money); the four and eight kinds of suffering (birth, old age, disease, death, parting from loved ones, meeting disliked ones, not getting what one seeks, pains of the five skandha) | |
| 四つ辻 | よつつじ | crossroads; intersection; crossway; carrefour | |
| 四六時中 | しろくじちゅう | around the clock; day and night | |
| 四股 | しこ | wrestler's ceremonial leg raising and stomping | |
| 四年 | よねん | four years | |
| 四角形 | しかくけい | quadrilateral; quadrangle; tetragon | |
| 四段 | よだん | fourth dan (in martial arts, go, shogi, etc.) | n1 |
| 四一 | しっぴん | scoring combination of a 4 and a 1 in oicho-kabu | |
| 四大 | よんだい | university or college offering four-year programs; the big four ...; the four major ... | |
| 四顧 | しこ | looking everywhere; looking in all four directions; neighborhood; vicinity | |
| 四通八達 | しつうはったつ | traffic network extending in all directions | |
| 四分五裂 | しぶんごれつ | torn asunder; disrupted and disorganized | |
| 再三再四 | さいさんさいし | repeatedly | |
| 四面楚歌 | しめんそか | being surrounded by enemies on all sides; being betrayed (forsaken) by everybody | |
| 藤四郎 | とうしろ | amateur; novice; layman | |
| 四球 | しきゅう | base on balls; walk; pass | n2 |
| 四角四面 | しかくしめん | square; formal; prim; stuffy | |
| 四日 | よっか | 4th day of the month; four days | n5 |
| 四つんばい | よつんばい | crawling on all fours; being on all fours; being on one's hands and knees | |
| 四半分 | しはんぶん | a fourth; quarter | |
| 四方山話 | よもやまばなし | talk about various topics | |
| 四半世紀 | しはんせいき | quarter of a century | |
| 四君子 | しくんし | the four gentlemen (plum, chrysanthemum, orchid, and bamboo) | |
| 四声 | しせい | four tones (of Chinese) | n3 |
| 四百余州 | しひゃくよしゅう | all China | |
| 四種 | よんしゅ | four kinds; four sorts; fourth-class mail | |
| 四諦 | したい | The Four Noble Truths | |
| 四時 | よじ | four o'clock | |
| 四捨五入 | ししゃごにゅう | rounding (off; a number); rounding half away from zero; rounding off (views); converging to a common opinion | |
| 四年生 | よねんせい | fourth-year student | |
| 四拍子 | よんびょうし | quadruple time; four-four time; common time; the four instruments in the accompanying orchestra in noh, etc. (flute, floor drum, small hand drum, large hand drum) | |
| 四方拝 | しほうはい | Prayer to the Four Quarters (Japanese imperial New Year's ceremony) | |
| 四本柱 | しほんばしら | four posts that used to support the roof over the ring | |
| 四手 | しで | zigzag-shaped paper streamer often used to adorn Shinto-related objects; hornbeam (deciduous tree in the birch family) | |
| 四緑 | しろく | fourth of nine traditional astrological signs (corresponding to Jupiter and south-east) | |
| 四重奏 | しじゅうそう | instrumental quartet | |
| 四分六 | しぶろく | six to four ratio; sixty-forty | |
| 四男 | よんなん | fourth son | |
| 四十九日 | しじゅうくにち | forty-ninth day after a person's death | |
| 四恩 | しおん | four gratitudes (to one's parents, all living beings, one's sovereign and the Three Jewels); four obligations | |
| 四十路 | よそじ | age forty; one's forties | |
| 四十八手 | しじゅうはって | the 48 basic techniques; every trick in the book; the 48 basic sexual positions | |
| 四海兄弟 | しかいけいてい | people in the whole world being all brothers; universal brotherhood | |
| 四姓 | しせい | the four Hindu castes; the four great families of the Heian period (esp. the Minamoto clan, the Taira clan, the Fujiwara clan and the Tachibana clan) | n3 |
| 四輪 | よんりん | four-wheeled | |
| 四等官 | しとうかん | four administrative positions (of the ritsuryō system: kami, suke, jou, sakan) | |
| 四百四病 | しひゃくしびょう | every type of disease | |
| 四聖 | しせい | the four great sages (Buddha, Christ, Confucius, Socrates) | n3 |
| 四則 | しそく | four (fundamental) rules of arithmetic | |
| 第四 | だいよん | fourth | |
| 十四日 | じゅうよっか | 14th day of the month; 14 days | |
| 三寒四温 | さんかんしおん | alternation of three cold and four warm days (usu. in late winter and early spring) | |
| 張三李四 | ちょうさんりし | the common run of men; the average Joe; good-for-nothing (person) | |
| 一九八四年 | せんきゅうひゃくはちじゅうよねん | Nineteen Eighty-Four (1949 novel by George Orwell) | |
| 十四 | じゅうし | fourteen; 14 | n2 |
| 四度 | よんど | four times; four-colour process printing; CMYK printing | |
| 四つ葉 | よつば | plant having four leaves on one stalk | |
| 四股名 | しこな | wrestler's stage name | |
| 四季咲き | しきざき | blooming in each season | |
| 四位 | しい | fourth court rank | |
| 四周 | ししゅう | periphery; circumference | |
| 四死球 | ししきゅう | bases on balls and pitches striking the batsmen | |
| 四字熟語 | よじじゅくご | four-character compound word (esp. idiomatic) | |
| 平行四辺形 | へいこうしへんけい | parallelogram | |
| 四丁 | シチョウ | ladder | n3 |
| 四分 | しぶん | dividing into four; quartering | |
| 四本 | よんほん | four (long cylindrical things) | |