| square(noun, figure, piece, square, diamond) | |
| quadrilateral(noun, square, diamond, angularity, four) | |
| quadrangle(noun, figure, angularity, four, quadrilateral) | |
| oblong(noun, figure, quadrilateral) | |
| block(noun, square) | |
| parallelogram(noun, figure, square, diamond, angularity) | |
| cube(noun, square) | |
| tetragon(noun, four) | |
| figure(noun, figure) | |
| polygon(noun, angularity) | |
| quadrature(noun, angularity, four) | |
| rhombus(noun, square, diamond, angularity, oblong) | |
| diamond(noun, angularity) | |
| four(noun, four) | |
| foursome(noun, four) | |
| quadrille(noun, four) | |
| quartet(noun, four) | |
| tetrahedron | |
| decagon(noun, angularity) | |
| heptagon(noun, angularity) |
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| APA | Smart Define. (2016). rectangle thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rectangle/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rectangle thesaurus" https://smartdefine.org/rectangle/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, rectangle thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rectangle/thesaurus/synonyms>. |
| MLA | Smart Define. "rectangle thesaurus" 11 February 2016. Web. 21 September 2026. <https://smartdefine.org/rectangle/thesaurus/synonyms> |