phoebe bird vs tyrant bird

phoebe bird and tyrant bird both are nouns.

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

As nouns, tyrant bird is a hypernym of phoebe bird; that is, tyrant bird is a word with a broader meaning than phoebe bird:

phoebe bird: small dun-colored North American flycatcher
tyrant bird: large American birds that characteristically catch insects on the wing

Other hypernyms of phoebe bird include flycatcher, New World flycatcher, tyrant flycatcher.

phoebe bird (noun)	tyrant bird (noun)
small dun-colored North American flycatcher	large American birds that characteristically catch insects on the wing