chatterer vs flycatcher

chatterer and flycatcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
chatterer	Yes	No	No	No
flycatcher	Yes	No	No	No

As nouns, flycatcher is a hypernym of chatterer; that is, flycatcher is a word with a broader meaning than chatterer:

chatterer: passerine bird of New World tropics
flycatcher: large American birds that characteristically catch insects on the wing

Other hypernyms of chatterer include New World flycatcher, tyrant bird, tyrant flycatcher.

chatterer (noun)	flycatcher (noun)
passerine bird of New World tropics	any of a large group of small songbirds that feed on insects taken on the wing
an obnoxious and foolish and loquacious talker	large American birds that characteristically catch insects on the wing