[1] : WordNet (r) 2.0

chatterbox
     n 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 syn: stream
          orchid, giant helleborine, epipactis gigantea
     2: an obnoxious and foolish and loquacious talker syn: chatterer,
         babbler, prater, magpie, spouter
see also:
stream orchid giant helleborine epipactis gigantea chatterer babbler prater 
magpie spouter 

[2] : Moby Thesaurus II by Grady Ward, 1.0

39 moby thesaurus words for "chatterbox":
   agreeable rattle, babbler, big talker, blab, blabber, blabberer,
   blabbermouth, blatherer, busybody, chatterer, conversationalist,
   gabber, gabbler, gasbag, gibble-gabbler, gossip, great talker,
   hot-air artist, idle chatterer, jabberer, jay, magpie,
   moulin a paroles, newsmonger, patterer, prater, prattler, quidnunc,
   rattle, sayer, scandalmonger, speaker, tabby, talker, tattletale,
   utterer, windbag, windjammer, word-slinger

Chatterbox >> C Words
Chatterbox, definition of term: Chatterbox
chatterbox_pag1.html