OCTAGON Antonyms There are 8 antonyms of the word octagon. (opposite meanings)Did you mean?Definition of OCTAGONSynonyms of OCTAGONAlso try opposite words for..octagonsoctagonalBest Opposite Words For OCTAGONTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1circleverb, noun, adjectivev, n, adj2dodecagonnounn3heptagonnounn4hexagonnounn5nonagonnounn6pentagonnounn7squareverb, nounv, n8triangleverb, nounv, n Alternatives for CIRCLE Words (21)roundbunchcoildiscdiskganggrouploopringbandcircuitencirclelaplotroachroofyroperophyrotaryroundaboutsetPhrases (4)dress circleforget me drugmexican valiumtraffic circleAbbreviations (1)r-2Opposite words for circle Alternatives for NONAGON Words (1)enneagonOpposite words for nonagon Alternatives for PENTAGON Words (3)five-sidedheptagonhexagonPhrases (1)the pentagonOpposite words for pentagon Alternatives for SQUARE Words (19)straightsquarelybourgeoisfeatherhashnormalorthogonalperpendicularpiazzaplazasharptetragonfoursquareheartylamesatisfyingsolidstraightforwardsubstantialPhrases (6)carpenter's squarepound signpublic squaresecond powersquare toessquare upOpposite words for square Alternatives for TRIANGLE Words (5)bluebottletrigonwyetriangulumtrilateralOpposite words for triangle