The Oxford Thesaurus An A-Z Dictionary of Synonyms - talkern.

1) speaker, lecturer, orator, speech-maker, keynoter, spellbinder, tub-thumper, rabble-rouser, demagogue, haranguer, ranter: You might disagree with what he says, but you must admit he's a great talker. 2) blusterer, blatherskite, swaggerer, show-off, Slang windbag, gasbag, lot of hot air, blowhard: He is a big talker, but he never gets anything done.