Synonyms for pest Found 7 synonyms across 2 meanings for “pest”. a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal (noun) plaguepestilencepestis a persistently annoying person (noun) blightercusspesterergadfly Explore Related Words Rhymes with pestSynonyms for plagueSynonyms for pestilenceSynonyms for pestisSynonyms for blighterSynonyms for cuss Synonym Finder | Rhyme Finder | Poetry Editor