cod vs Alaska cod

cod and Alaska cod both are nouns.

Word	Noun	Adjective	Verb	Adverb
cod	Yes	Yes	Yes	No
Alaska cod	Yes	No	No	No

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

cod (noun)	Alaska cod (noun)
major food fish of Arctic and cold-temperate waters	closely related to Atlantic cod
lean white flesh of important North Atlantic food fish; usually baked or poached
the vessel that contains the seeds of a plant (not the seeds themselves)

cod (adjective)	Alaska cod (adjective)
payable by the recipient on delivery

cod (verb)	Alaska cod (verb)
harass with persistent criticism or carping
fool or hoax