1) Australian play 2) Big talker 3) Chatterbox 4) Exclusively Anglo word 5) Exclusively Saxon word 6) Gossip 7) Gossiper 8) Gossipmonger 9) Newsmonger 10) Not the secretive sort 11) Rumormonger 12) Rumourmonger 13) Talebearer 14) Taleteller 15) Tattler 16) Tattletale 17) Telltale 18) Variety of non-clam 1) Chatterer 2) Jawer 3) Snitch 4) Talebearer 5) Taleteller 6) Talker 7) Tattler 8) Tattletale 9) Yenta 
Blabbermouth is slang for someone who talks too much, revealing secrets.
a person who talks too much, esp. indiscreetly.