LEPTON Antonyms There are 3 antonyms of the word lepton. (opposite meanings)Did you mean?Definition of LEPTONSynonyms of LEPTONBest Opposite Words For LEPTONTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1electronnounn2neutronnounn3protonnounn Alternatives for ELECTRON Words (1)negatronOpposite words for electron