Synonyms for crust Found 9 synonyms across 3 meanings for “crust”. the outer layer of the Earth (noun) a hard outer layer that covers something (noun) incrustationencrustation the trait of being rude and impertinent (noun) gallimpertinenceimpudenceinsolencecheekinessfreshness Explore Related Words Rhymes with crustSynonyms for incrustationSynonyms for encrustationSynonyms for gallSynonyms for impertinenceSynonyms for impudence Synonym Finder | Rhyme Finder | Poetry Editor