| amicus curiae | |
| amigo(noun, companion, friend, sister) | |
| analog(noun, companion, friend, contemporary, acquaintance) | |
| analogon | |
| analogue | |
| assistant(noun, companion, friend, contemporary, acquaintance) | |
| attorney | |
| backer | |
| backup | |
| backup man | |
| bedmate(noun, companion, friend, contemporary, acquaintance) | |
| better self | |
| bosom buddy(noun, expression, associate, companion, friend) | |
| bride(noun, companion, friend, contemporary, acquaintance) | |
| casual acquaintance | |
| china | |
| chip off the old block(noun, expression, idiom, likeness, replica) | |
| classmate(noun, associate, companion, friend, contemporary) | |
| close acquaintance | |
| close copy |
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| APA | Smart Define. (2015). alter ego thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/alter_ego/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "alter ego thesaurus" https://smartdefine.org/alter_ego/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, alter ego thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/alter_ego/thesaurus/synonyms>. |
| MLA | Smart Define. "alter ego thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/alter_ego/thesaurus/synonyms> |