| female sibling(expression, idiom) | |
| fry | |
| girl | |
| half sister(expression, idiom) | |
| infant | |
| informal family member(expression, idiom) | |
| little sister(expression, idiom) | |
| newborn | |
| nipper | |
| nun | |
| nurse | |
| nursling | |
| one sib | |
| pal(noun, friend) | |
| safety injection system(expression, idiom) | |
| secret intelligence service(expression, idiom) | |
| shaver | |
| stepsister | |
| suckling | |
| tes |
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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> |