tyrant flycatcher vs tyrant bird

tyrant flycatcher and tyrant bird both are nouns.

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

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

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

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

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