tyrant bird vs flycatcher

tyrant bird and flycatcher both are nouns.

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

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

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

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

tyrant bird (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