blabbermouth vs talebearer

blabbermouth and talebearer both are nouns.

Word	Noun	Adjective	Verb	Adverb
blabbermouth	Yes	No	No	No
talebearer	Yes	No	No	No

As nouns, blabbermouth and talebearer are synonyms defined as:

Other synonyms of blabbermouth include taleteller, tattler, tattletale, telltale.

blabbermouth (noun)	talebearer (noun)
someone who gossips indiscreetly	someone who gossips indiscreetly