Phasianus colchicus vs pheasant

Phasianus colchicus and pheasant both are nouns.

Word	Noun	Adjective	Verb	Adverb
Phasianus colchicus	Yes	No	No	No
pheasant	Yes	No	No	No

As nouns, pheasant is a hypernym of Phasianus colchicus; that is, pheasant is a word with a broader meaning than Phasianus colchicus:

Phasianus colchicus: common pheasant having bright plumage and a white neck ring
pheasant: large long-tailed gallinaceous bird native to the Old World but introduced elsewhere

Phasianus colchicus (noun)	pheasant (noun)
common pheasant having bright plumage and a white neck ring	large long-tailed gallinaceous bird native to the Old World but introduced elsewhere
	flesh of a pheasant; usually braised