Synonyms of 'chatterbox'
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Blather is also a noun.
Anyone knows that this is all blather.
waffle (informal , British)
bizzo (Australian , slang)
bull's wool (Australian , New Zealand , slang)
hokum (slang , US , Canadian)
bunkum or buncombe (US)
Thesaurus for chatterbox from the Collins English Thesaurus
A chatterbox is someone who talks a lot .