| quadrivial(adjective, four) | |
| quadrivium(noun, four) | |
| quadrumvirate(noun, four) | |
| quadruped | |
| quadruplets(noun, four) | |
| quadruplicate(adjective, four) | |
| quarter | |
| quarto | |
| quaternate(adjective, four) | |
| queen(noun, amusement) | |
| rectangular | |
| rowing boat | |
| seven | |
| sextet | |
| six | |
| square dance | |
| squaring | |
| ten | |
| tetrarch | |
| twice two(expression, idiom) |
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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> |