tattletale vs tattler

tattletale and tattler both are nouns.

Word	Noun	Adjective	Verb	Adverb
tattletale	Yes	No	No	No
tattler	Yes	No	No	No

As nouns, tattletale and tattler are synonyms defined as:

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

tattletale (noun)	tattler (noun)
someone who gossips indiscreetly	any of several long-legged shorebirds having a loud whistling cry
	someone who gossips indiscreetly