tyrant flycatcher vs flycatcher

tyrant flycatcher and flycatcher both are nouns.

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

As nouns, tyrant flycatcher and flycatcher are synonyms defined as:

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

Other synonyms of tyrant flycatcher include New World flycatcher, tyrant bird.

tyrant flycatcher (noun)	flycatcher (noun)
large American birds that characteristically catch insects on the wing	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