| Kanji 漢字 / Romaji 音韻 | Kana / Hiragana / Phonetic | Definition |
| 落し子 | おとしご | (n) nobleman's illegitimate child / evil consequence |
| otoshi ko | otoshigo |
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| 落し胤 | おとしだね | (n) nobleman's illegitimate child |
| otoshi tane | otoshidane |
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| 隠し子 | かくしご | (n) illegitimate child |
| kakushi ko | kakushigo |
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| 私生子 | しせいし | (n) illegitimate child |
| shisei ko | shiseishi |
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| 私生児 | しせいじ | (n) illegitimate child |
| shiseiji | shiseiji |
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| 私生児出産 | しせいじしゅっさん | illegitimate birth |
| shiseiji shussan | shiseijishussan |
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| 妾出 | しょうしゅつ | (n) illegitimate (e.g., born to a mistress) |
| mekake shutsu | shoushutsu |
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| 妾腹 | しょうふく | (n) illegitimate (e.g. born to a mistress) |
| shoufuku | shoufuku |
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| 庶子 | しょし | (n) illegitimate child |
| sho ko | shoshi |
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| 庶出 | しょしゅつ | (n) illegitimate birth |
| sho shutsu | shoshutsu |
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| 庶流 | しょりゅう | (n) illegitimate family lineage |
| sho ryuu | shoryuu |
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| 正閏 | せいじゅん | (n) normal and leap (years) / legitimate and illegitimate dynasties |
| sei uruu | seijun |
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| 父無し子 | ちちなしご | (n) fatherless or illegitimate child |
| chichi nashi ko | chichinashigo |
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| 父無し子 | ててなしご | (n) fatherless or illegitimate child |
| chichi nashi ko | tetenashigo |
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| 認知 | にんち | acknowledgement (of an illegitimate child) |
| ninchi | ninchi |
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| 非嫡出子 | ひちゃくしゅつし | (n) illegitimate child |
| hi chakushutsu ko | hichakushutsushi |
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| 妾腹 | めかけばら | (n) illegitimate (e.g. born to a mistress) |
| shoufuku | mekakebara |
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| 落胤 | らくいん | (n) nobleman's illegitimate child |
| rakuin | rakuin |
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