blabbermouth vs taleteller

blabbermouth and taleteller both are nouns.

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

As nouns, blabbermouth and taleteller are synonyms defined as:

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

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