telltale vs gossiper

telltale and gossiper both are nouns.

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

As nouns, gossiper is a hypernym of telltale; that is, gossiper is a word with a broader meaning than telltale:

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

Other hypernyms of telltale include gossip, gossipmonger, newsmonger, rumormonger, rumourmonger.

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

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