yapper
Noun
Meaning
(slang) One's mouth, especially of a gossipy person.
Shut your yapper or I'll shut it for you!
One who yaps.
(slang) A dog, especially of a small breed.
Source: en.wiktionary.orgSynonyms
barker
squealer
gossiper
motormouth
chatterbox
blowhard
chatterer
loudmouth
windbag
gossipmonger
prattler
yelper
raffler