| interlaced(adjective, correlational) | |
| intermeshed(adjective, correlational) | |
| isochronal | |
| isochronous | |
| joint(adjective, similar, contemporary, collateral, attendant) | |
| knit together(expression, adjective, similar, interchangeable, proportionate) | |
| meshed(adjective, correlational) | |
| of that ilk(expression, adjective, idiom, similar, interchangeable) | |
| related(adjective, like, parallel, subordinate, identical) | |
| relatively prime(expression, idiom, number) | |
| relevant(adjective, similar, interchangeable, proportionate, homologous) | |
| replacement | |
| replenishing | |
| replenishment | |
| requited | |
| satellite(contemporary, secondary, connected, indirect, accompanying) | |
| secondary(adjective, support, spare, subordinate, indirect) | |
| subordinate(adjective, support, spare, secondary, indirect) | |
| subservient(adjective, support, spare, subordinate, secondary) | |
| substitutable(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> |