| ally | |
| analog(noun, companion, friend, contemporary, acquaintance) | |
| analogon | |
| analogue | |
| antilogarithm(noun, mathematics) | |
| argument | |
| arithmetic(noun, mathematics) | |
| arithmetical | |
| assistant(noun, associate, companion, friend, contemporary) | |
| avenging(adjective, reactive, tit-for-tat, retaliatory) | |
| back and forth(expression, idiom) | |
| beating | |
| bedmate(noun, companion, friend, contemporary, acquaintance) | |
| bride(noun, companion, friend, contemporary, acquaintance) | |
| brother | |
| calculus(noun, mathematics) | |
| carbon(noun, adjective, reproduction, copy, spare) | |
| carbon copy(noun, expression, reproduction, copy, spare) | |
| cardinal | |
| chum(noun, companion, friend, contemporary, acquaintance) |
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| APA | Smart Define. (2016). reciprocal thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/reciprocal/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "reciprocal thesaurus" https://smartdefine.org/reciprocal/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, reciprocal thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/reciprocal/thesaurus/synonyms>. |
| MLA | Smart Define. "reciprocal thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/reciprocal/thesaurus/synonyms> |