gnawer

one who is obnoxiously annoying like a dog who won't let go of a bone, that gnawer in the backseat wouldn't quit mentioning that I had made a wrong turn and gotten us lost Synonyms annoyance, annoyer, bother, gadfly, nuisance, nudnik (also nudnick), pain, persecutor, pest, tease, teaserRelated Words headache; harrier, heckler, interrupter (also interruptor); hassle, plague; harasser, molester, tormentor (also tormenter), torturerNear Antonyms charmer, smoothy (or smoothie); comforter, solacer, soother