| 弟 | おとうと | younger brother; little brother; kid brother; brother-in-law (spouse's younger brother or younger sister's husband) | n5 |
| 兄弟 | きょうだい | brothers and sisters; siblings; half-siblings; step-siblings | n5 |
| 弟子 | でし | pupil; disciple; adherent; follower | n2 |
| 子弟 | してい | children; sons; children and younger brothers; young people | n3 |
| 従弟 | じゅうてい | cousin (younger male) | |
| 師弟 | してい | teacher and student | n3 |
| 門弟 | もんてい | disciple; pupil; follower | |
| 従兄弟 | いとこ | cousin (male) | |
| 弟妹 | ていまい | younger brother and sister | |
| 義弟 | ぎてい | brother-in-law (spouse's younger brother or younger sister's husband); younger stepbrother | |
| 高弟 | こうてい | best pupil; leading disciple | n2 |
| 内弟子 | うちでし | private pupil; apprentice | |
| 舎弟 | しゃてい | one's younger brother; underling (e.g. in yakuza); junior male peer; sworn younger brother | |
| 徒弟 | とてい | apprentice | |
| 兄弟分 | きょうだいぶん | sworn brother; buddy; pal | |
| 末弟 | ばってい | youngest brother; last disciple | |
| 実弟 | じってい | biological younger brother | |
| 兄弟子 | あにでし | senior pupil (of the same master); senior disciple; senior student; senior member | |
| 弟子入り | でしいり | becoming a pupil (of); becoming an apprentice | |
| 弟分 | おとうとぶん | sworn younger brother; junior male peer (in a club, group, etc.) | |
| 仏弟子 | ぶつでし | Buddhist; disciple of Buddha | |
| 令弟 | れいてい | your younger brother | |
| 愛弟子 | まなでし | favorite pupil; favourite pupil; teacher's pet | |
| 義兄弟 | ぎきょうだい | brother-in-law; stepbrother; sworn brother | |
| 相弟子 | あいでし | fellow students | |
| 小弟 | しょうてい | little brother; younger brother; my younger brother; I | |
| 異母弟 | いぼてい | younger half-brother (by a different mother) | |
| 孫弟子 | まごでし | disciples of one's disciples | |
| 乳兄弟 | ちきょうだい | foster sibling; foster brother; foster sister | |
| 直弟子 | じきでし | personal pupil | |
| 愚弟 | ぐてい | (one's) younger brother; foolish younger brother | |
| 亡弟 | ぼうてい | one's deceased younger brother | |
| 弟弟子 | おとうとでし | younger pupil (of the same master); younger disciple; junior member | |
| 四海兄弟 | しかいけいてい | people in the whole world being all brothers; universal brotherhood | |
| 孝弟 | こうてい | filial piety; brotherly love | n2 |
| 賢弟 | けんてい | wise younger brother; polite reference to another's younger brother, or to one's junior | |
| 新弟子 | しんでし | new disciple; new student; new apprentice; newly accepted professional wrestlers | |
| 親兄弟 | おやきょうだい | parents and siblings; one's relatives | |
| 弟切草 | おとぎりそう | Hypericum erectum (species of St. John's wort) | |
| 弟殺し | おとうとごろし | killing a younger brother; fratricide | |
| 少弟 | しょうてい | little brother; younger brother; my younger brother; I | |
| 又弟子 | またでし | indirect pupil | |
| 御兄弟 | ごきょうだい | siblings; brothers and sisters | |
| まな弟子 | まなでし | favorite pupil; favourite pupil; teacher's pet | |
| 姉弟 | してい | older sister and younger brother | n3 |
| 皇弟 | こうてい | younger brother of an Emperor | n2 |
| 昆弟 | こんてい | brothers | n1 |
| 弟君 | おとうとぎみ | younger brother | |
| 弟姫 | おとひめ | younger princess; Oto Hime; Princess of the Dragon Palace (from the story of Urashima Tarō) | |
| 弟娘 | おとうとむすめ | younger daughters | |
| 弟嫁 | おとうとよめ | younger brother's wife | |
| 弟御 | おとうとご | your younger brother | |
| 弟月 | おとづき | 12th lunar month | |
| 弟矢 | おとや | arrow with feathers that curve to the right (the second of two arrows to be fired) | |
| 弱弟 | じゃくてい | young brother | |
| 王弟 | おうてい | king's younger brother; royal brother | |
| ご兄弟 | ごきょうだい | siblings; brothers and sisters | |
| 兄弟児 | きょうだいじ | sibling with disabilities; (child) sibling | |
| 兄弟愛 | きょうだいあい | brotherly love; fraternal love; sibling affection | |
| 再従弟 | さいじゅうてい | younger second cousin | |
| 又従弟 | またいとこ | second cousin | |
| 女兄弟 | おんなきょうだい | sisters; female siblings | |
| 弟さん | おとうとさん | younger brother | |
| 弟夫婦 | おとうとふうふ | one's younger brother and his wife | |
| 弟小父 | おとおじ | parent's younger brother; uncle | |
| 弟息子 | おとうとむすこ | younger sons | |
| 男兄弟 | おとこきょうだい | brothers; male siblings | |
| 異父弟 | いふてい | younger half-brother (by a different father) | |
| 穴兄弟 | あなきょうだい | men who have had sex with the same woman; hole brothers | |
| 一番弟子 | いちばんでし | the (one's) best pupil; the (one's) top disciple | |
| 三従兄弟 | さんじゅうけいてい | second cousin | |
| 二従兄弟 | ふたいとこ | second cousin | |
| 二従姉弟 | ふたいとこ | second cousin | |
| 企業舎弟 | きぎょうしゃてい | front company (for an organized crime operation) | |
| 兄弟会社 | きょうだいがいしゃ | affiliated company; sister company | |
| 兄弟喧嘩 | きょうだいげんか | quarrel between brothers | |
| 兄弟姉妹 | きょうだいしまい | brothers and sisters; siblings | |
| 兄弟弟子 | きょうだいでし | fellow pupil; fellow apprentice | |
| 再従兄弟 | はとこ | second cousin | |
| 再従姉弟 | はとこ | second cousin | |
| 十大弟子 | じゅうだいでし | the ten great disciples (of Buddha) | |
| 又従兄弟 | またいとこ | second cousin | |
| 又従姉弟 | またいとこ | second cousin | |
| 弟切草属 | オトギリソウぞく | Hypericum (plant genus including St. John's worts) | |
| 弟切草目 | オトギリソウもく | Guttiferales (plant order) | |
| 弟切草科 | オトギリソウか | Clusiaceae (family of plants including St. John's worts and mangosteens); Guttiferae | |
| 弥従兄弟 | いやいとこ | second cousin | |
| 徒弟制度 | とていせいど | an apprentice system; apprenticeship | |
| 従兄弟半 | いとこはん | first cousin once removed | |
| 従兄弟煮 | いとこに | vegetables boiled in miso | |
| 愚兄賢弟 | ぐけいけんてい | a foolish older brother and a smart younger | |
| 異母兄弟 | いぼきょうだい | half-sibling (with a different mother) | |
| 異父兄弟 | いふきょうだい | half-sibling (with a different father) | |
| 兄弟げんか | きょうだいげんか | quarrel between brothers | |
| 平行従兄弟 | へいこういとこ | parallel cousins; ortho-cousins | |
| 従兄弟違い | いとこちがい | parent's cousin; first-cousin once removed | |
| 新弟子検査 | しんでしけんさ | medical examination of entrants into professional wrestling | |
| 西洋弟切草 | セイヨウオトギリソウ | St. John's wort (Hypericum perforatum) | |
| 兄弟牆に鬩ぐ | けいていかきにせめぐ | to quarrel among friends (or siblings) | |
| 兄弟牆にせめぐ | けいていかきにせめぐ | to quarrel among friends (or siblings) | |