utterer vs mumbler

Other hyponyms of utterer include alliterator, caller-up, caller, phoner, telephoner, babbler, chatterbox, chatterer, magpie, prater, spouter, conversationalist, conversationist, schmoozer, dictator, drawler, driveller, jabberer, ejaculator, growler, asker, enquirer, inquirer, querier, questioner, lecturer, lisper, mentioner, motormouth, murmurer, mutterer, narrator, storyteller, teller, orator, public speaker, rhetorician, speechifier, speechmaker, prattler, ranter, raver, reciter, native speaker, stammerer, stutterer, stentor, talking head, venter, vociferator, voicer, wailer, whisperer, informant, witness, witnesser.