Cornish fowl vs fowl

Cornish fowl and fowl both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cornish fowl	Yes	No	No	No
fowl	Yes	No	Yes	No

As nouns, fowl is a hypernym of Cornish fowl; that is, fowl is a word with a broader meaning than Cornish fowl:

Cornish fowl: English breed of compact domestic fowl; raised primarily to crossbreed to produce roasters
fowl: a domesticated gallinaceous bird thought to be descended from the red jungle fowl

Other hypernyms of Cornish fowl include domestic fowl, poultry.

Cornish fowl (noun)	fowl (noun)
English breed of compact domestic fowl; raised primarily to crossbreed to produce roasters	a domesticated gallinaceous bird thought to be descended from the red jungle fowl
	the flesh of a bird or fowl (wild or domestic) used as food

Cornish fowl (verb)	fowl (verb)
	hunt fowl in the forest
	hunt fowl