gossiper vs telltale

gossiper and telltale both are nouns.

Word	Noun	Adjective	Verb	Adverb
gossiper	Yes	No	No	No
telltale	Yes	Yes	No	No

As nouns, telltale is a hyponym of gossiper; that is, telltale is a word with a more specific, narrower meaning than gossiper:

gossiper: a person given to gossiping and divulging personal information about others
telltale: someone who gossips indiscreetly

Other hyponyms of gossiper include cat, scandalmonger, blabbermouth, talebearer, taleteller, tattler, tattletale, yenta.

gossiper (noun)	telltale (noun)
a person given to gossiping and divulging personal information about others	someone who gossips indiscreetly

gossiper (adjective)	telltale (adjective)
	disclosing unintentionally something concealed