ISOBUTANE Antonyms There are 8 antonyms of the word isobutane. (opposite meanings)Did you mean?Definition of ISOBUTANESynonyms of ISOBUTANEBest Opposite Words For ISOBUTANETop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1butanenounn2heptanenounn3hexanenounn4octaneverb, noun, adjectivev, n, adj5propanenounn6decanenounn7nonanenounn8pentanenounn Alternatives for OCTANE Words (3)fuelgasolinepetrolOpposite words for octane Alternatives for PROPANE Words (1)propellantOpposite words for propane