pewit vs tyrant bird

pewit and tyrant bird both are nouns.

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

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

pewit: small olive-colored woodland flycatchers of eastern North America
tyrant bird: large American birds that characteristically catch insects on the wing

Other hypernyms of pewit include flycatcher, New World flycatcher, tyrant flycatcher.

pewit (noun)	tyrant bird (noun)
large crested Old World plover having wattles and spurs	large American birds that characteristically catch insects on the wing
small olive-colored woodland flycatchers of eastern North America
small black-headed European gull