tattletale vs rumormonger

tattletale and rumormonger both are nouns.

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

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

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

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

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