square has 14 distinct synonyms spread across 15 of its 25 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is round.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
(geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon
“you can compute the area of a square if you know the length of its sides”
the product of two equal terms
“nine is the second power of three”
an open area at the meeting of two or more streets
something approximating the shape of a square
a formal and conservative person with old-fashioned views
any artifact having a shape similar to a plane geometric figure with four equal sides and four right angles
“a checkerboard has 64 squares”
a hand tool consisting of two straight arms at right angles; used to construct or test right angles
“the carpenter who built this room must have lost his square”
cause to match, as of ideas or acts
having four equal sides and four right angles or forming a right angle
“a square peg in a round hole”
1 of the 25 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for square.
Synonyms, antonyms and the broader and narrower relations for square come from Princeton University’s WordNet. Full sources and licences.
be compatible with
“one idea squares with another”
pay someone and settle a debt
“I squared with him”
rigidly conventional or old-fashioned