| sister(noun, companion, friend, mate, comrade) | |
| babe(informal, noun) | |
| brother(companion, friend, mate, comrade, sister) | |
| sibling | |
| son | |
| amiga(companion, friend, mate, comrade, sister) | |
| amigo(companion, friend, mate, comrade, sister) | |
| aunt | |
| baby | |
| blood brother | |
| boon companion(expression, companion, friend, mate, comrade) | |
| bosom buddy(expression, companion, friend, mate, comrade) | |
| brethren | |
| bub | |
| bud | |
| buddy | |
| connate(companion, friend, mate, comrade, sister) | |
| country cousin | |
| cousin | |
| cuz(companion, friend, mate, comrade, sister) |
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| APA | Smart Define. (2015). sis thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/sis/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sis thesaurus" https://smartdefine.org/sis/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, sis thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/sis/thesaurus/synonyms>. |
| MLA | Smart Define. "sis thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/sis/thesaurus/synonyms> |