wildfowl vs pheasant

wildfowl and pheasant both are nouns.

Word	Noun	Adjective	Verb	Adverb
wildfowl	Yes	No	No	No
pheasant	Yes	No	No	No

As nouns, pheasant is a hyponym of wildfowl; that is, pheasant is a word with a more specific, narrower meaning than wildfowl:

Other hyponyms of wildfowl include grouse, quail, partridge.

wildfowl (noun)	pheasant (noun)
flesh of any of a number of wild game birds suitable for food	large long-tailed gallinaceous bird native to the Old World but introduced elsewhere
	flesh of a pheasant; usually braised