14 entries under equilateral topic. ×

13
orthogonal(adjective, regular, square, patterned, symmetrical)
10
square(adjective, regular, angularity, patterned, symmetrical)
6
right-angled(adjective, regular, square, patterned, symmetrical)
5
quadrilateral(adjective, square, angularity, four)
3
foursquare(adjective, regular, square, angularity, patterned)
2
quadrate(adjective, regular, square, symmetrical, angled)
1
boxlike(adjective, regular, square, patterned, symmetrical)
1
boxy(adjective, regular, square, patterned, symmetrical)
1
equal-sided(adjective, regular, square, patterned, symmetrical)
1
four-sided(adjective, regular, square, symmetrical, angled)
1
quadratic(adjective, regular, square, patterned, symmetrical)
1
quadratical(adjective, regular, square, patterned, symmetrical)
1
rectilinear(adjective, regular, square, patterned, symmetrical)
1
squarish(adjective, regular, square, patterned, symmetrical)
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APASmart Define. (2015). rectangular thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rectangular/thesaurus/synonyms
ChicagoSmart Define. 2015. "rectangular thesaurus" https://smartdefine.org/rectangular/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, rectangular thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rectangular/thesaurus/synonyms>.
MLASmart Define. "rectangular thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/rectangular/thesaurus/synonyms>