flycatcher vs tyrant flycatcher

flycatcher and tyrant flycatcher both are nouns.

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

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

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

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

flycatcher (noun)	tyrant 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