blabbermouth
Noun
Meaning
someone who gossips indiscreetly
Source: WordNetSynonyms
telltale
tattletale
talebearer
tattler
taleteller
jay
barker
cicero
informer
prater
polly
magpie
squeaker
gossip
gascon
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Antonyms
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Examples
They had come home a bit intoxicated and James was a huge blabbermouth when it came to things like this.
You can find out about all the category organizers on the (including way too much info about me--evidently I was a blabbermouth when I wrote that).