telltale vs rumormonger

telltale and rumormonger both are nouns.

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

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

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

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

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

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