rumormonger vs telltale

rumormonger and telltale both are nouns.

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

As nouns, telltale is a hyponym of rumormonger; that is, telltale is a word with a more specific, narrower meaning than rumormonger:

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

Other hyponyms of rumormonger include cat, scandalmonger, blabbermouth, talebearer, taleteller, tattler, tattletale, yenta.

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

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