| fifteen | |
| figurative bulk(expression, idiom) | |
| five and twenty(expression, idiom, five) | |
| four and twenty(expression, idiom, five) | |
| four score(expression, idiom, five) | |
| fourscore | |
| fourscore and ten(expression, idiom, five) | |
| good | |
| half-a-dozen | |
| half a hundred(expression, idiom, five) | |
| hexadic(adjective, six) | |
| hexagon(noun, six) | |
| hexagonal(adjective, six) | |
| hexagram(noun, six) | |
| idenequivalence | |
| identity | |
| ignore the law(expression, idiom, illegality) | |
| infringe | |
| infringe a custom(expression, idiom, unconformity) | |
| infringe a habit(expression, idiom, unconformity) |
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| APA | Smart Define. (2016). six thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/six/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "six thesaurus" https://smartdefine.org/six/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, six thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/six/thesaurus/synonyms>. |
| MLA | Smart Define. "six thesaurus" 12 March 2016. Web. 21 September 2026. <https://smartdefine.org/six/thesaurus/synonyms> |