tattletale vs gossiper

tattletale and gossiper both are nouns.

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

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

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

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

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