flycatcher vs New World flycatcher

flycatcher and New World flycatcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
flycatcher	Yes	No	No	No
New World flycatcher	Yes	No	No	No

As nouns, flycatcher and New World flycatcher are synonyms defined as:

flycatcher and New World flycatcher: large American birds that characteristically catch insects on the wing

Other synonyms of flycatcher include tyrant bird, tyrant flycatcher.

flycatcher (noun)	New World flycatcher (noun)
any of a large group of small songbirds that feed on insects taken on the wing	large American birds that characteristically catch insects on the wing
large American birds that characteristically catch insects on the wing