tattling vs blabbermouthed

tattling and blabbermouthed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tattling	No	Yes	No	No
blabbermouthed	No	Yes	No	No

As adjectives, tattling and blabbermouthed are synonyms defined as:

tattling and blabbermouthed: prone to communicate confidential information

Other synonyms of tattling include leaky, talebearing.

tattling (adjective)	blabbermouthed (adjective)
prone to communicate confidential information	prone to communicate confidential information
	unwisely talking too much