tattletale vs rumourmonger

tattletale and rumourmonger both are nouns.

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

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

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

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

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