TIGHTENER Antonyms There are 6 antonyms of the word tightener. (opposite meanings)Did you mean?Definition of TIGHTENERSynonyms of TIGHTENERAlso try opposite words for..tightentightenedtighteningtightenersBest Opposite Words For TIGHTENERTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1openernounn2relaxernounn3unfastenernounn4loosenernounn5releasernounn6slackenernounn Alternatives for OPENER Words (19)beginnercatalystcreatorfirstforerunnerinitiatorinstigatorleaderoriginatorpioneerprecursorprogenitorstartertrailblazerinauguratorintroducerundoerunfasteneruntierOpposite words for opener Alternatives for UNFASTENER Words (3)openerundoeruntierOpposite words for unfastener