| quartet(noun, adjective, four) | |
| quaternary(noun, adjective, four) | |
| foursome | |
| tetrad(noun, adjective, four) | |
| quaternity(noun, four) | |
| quaternion(noun, four) | |
| quadruplet(noun, four) | |
| square(noun, adjective) | |
| Quaternary | |
| 4 | |
| quatern | |
| rectangle | |
| iv | |
| quad(noun, adjective) | |
| quadrangle | |
| quadrilateral(noun, adjective) | |
| quadruple(noun, adjective, four) | |
| quartette(noun, four) | |
| tetralogy(noun, four) | |
| quadrigeminal(noun, adjective, four) |
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| APA | Smart Define. (2015). Four thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/four/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "Four thesaurus" https://smartdefine.org/four/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, Four thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/four/thesaurus/synonyms>. |
| MLA | Smart Define. "Four thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/four/thesaurus/synonyms> |