| square(noun, adjective, form, square, angularity) | |
| quadrangle(noun, form, figure, shape, angularity) | |
| four-sided(adjective, square, equilateral) | |
| rectangle(noun, square, diamond, angularity, four) | |
| diamond(noun, adjective, form, angularity, oblong) | |
| rectangular(adjective, square, angularity, four, equilateral) | |
| quadrangular(adjective, angularity, four) | |
| four(noun, adjective, four) | |
| parallelogram(noun, form, shape, square, diamond) | |
| polygon(noun, form, shape, angularity) | |
| multilateral(adjective, angularity, laterality) | |
| tetragon | |
| foursquare(square, angularity, equilateral) | |
| bilateral(adjective, laterality) | |
| foursome(noun, four) | |
| quad(noun, adjective, four) | |
| quartet(noun, adjective, four) | |
| trilateral(adjective, angularity, laterality) | |
| oblong | |
| quadrate(adjective, square, equilateral) |
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| APA | Smart Define. (2015). quadrilateral thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/quadrilateral/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "quadrilateral thesaurus" https://smartdefine.org/quadrilateral/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, quadrilateral thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/quadrilateral/thesaurus/synonyms>. |
| MLA | Smart Define. "quadrilateral thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/quadrilateral/thesaurus/synonyms> |