RichThesaurus
blabbermouthed
vs
motormouthed
blabbermouthed
adj
Talkative, especially in an indiscreet manner.
motormouthed
adj
Being a motor mouth; inclined to talk too much.
How often have the words
blabbermouthed
and
motormouthed
occurred in a corpus of books?
(source:
Google Ngram Viewer
)