Synonyms of 'tattletale'
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If you refer to someone as a busybody, you are criticizing the way they interfere in other people's affairs.
Some busybody tipped off the police.
A chatterbox is someone who talks a lot.
My five-year-old daughter's a real little chatterbox.
Thesaurus for tattletale from the Collins English Thesaurus
a scandalmonger or gossip