1) Bass 2) Blab 3) Boaster 4) Croc 5) Sea bass 1) Bean spiller 2) Blabber 3) Blabbing type 4) Blabby sort 5) Kind of bass 6) Loud lout 7) One who blabs 8) One who might spill the beans 
Bigmouth is slang for a noisy, indiscreet, or boastful person.
a loud, talkative person, esp. one who lacks discretion. · any of several fishes having an unusually large mouth.