pewit vs flycatcher

pewit and flycatcher both are nouns.

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

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

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

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

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