tattler vs gossipmonger

tattler and gossipmonger both are nouns.

Word	Noun	Adjective	Verb	Adverb
tattler	Yes	No	No	No
gossipmonger	Yes	No	No	No

As nouns, gossipmonger is a hypernym of tattler; that is, gossipmonger is a word with a broader meaning than tattler:

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

Other hypernyms of tattler include gossip, gossiper, newsmonger, rumormonger, rumourmonger.

tattler (noun)	gossipmonger (noun)
any of several long-legged shorebirds having a loud whistling cry	a person given to gossiping and divulging personal information about others
someone who gossips indiscreetly