| antonymous | |
| appurtenant(adjective, support, spare, subordinate, secondary) | |
| associated(adjective, similar, attendant, related, linked) | |
| associated with | |
| associative | |
| attendant(contemporary, secondary, connected, indirect, accompanying) | |
| attending | |
| back-and-forth(adjective, correlational) | |
| belonging | |
| co-active(adjective, correlational) | |
| coefficient | |
| coequal | |
| coetaneous | |
| coeval | |
| coexistent | |
| cognate(adjective, similar, linked, relevant, connected) | |
| coincidental(adjective, like, parallel, joint, identical) | |
| collaborative(adjective, correlational) | |
| common(adjective, joint, interchangeable, proportionate, homologous) | |
| commutable(adjective, similar, identical, interchangeable, proportionate) |
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| APA | Smart Define. (2015). complementary thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/complementary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "complementary thesaurus" https://smartdefine.org/complementary/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, complementary thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/complementary/thesaurus/synonyms>. |
| MLA | Smart Define. "complementary thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/complementary/thesaurus/synonyms> |