cochin vs domestic fowl

cochin and domestic fowl both are nouns.

Word	Noun	Adjective	Verb	Adverb
cochin	Yes	No	No	No
domestic fowl	Yes	No	No	No

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

cochin: Asian breed of large fowl with dense plumage and feathered legs
domestic fowl: a domesticated gallinaceous bird thought to be descended from the red jungle fowl

Other hypernyms of cochin include fowl, poultry.

cochin (noun)	domestic fowl (noun)
Asian breed of large fowl with dense plumage and feathered legs	a domesticated gallinaceous bird thought to be descended from the red jungle fowl