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Synonyms for Chatterbox (same or very similar meaning)

WordNet sense 1 (orchid growing along streams or ponds of western North America having leafy stems and 1 greenish-brown and pinkish flower in the axil of each upper leaf):
stream orchid, Epipactis gigantea, giant helleborine

WordNet sense 2 (an obnoxious and foolish and loquacious talker):
babbler, chatterer, magpie, prater, spouter

From the ODE community, based on WordNetadd/edit