Synonyms for Babbler (same or very similar meaning)
WordNet sense 1 (an obnoxious and foolish and loquacious talker):
chatterbox, chatterer, magpie, prater, spouterWordNet sense 2 (any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae):
cacklerFrom the ODE community, based on WordNetadd/edit