cod vs Pacific cod

cod and Pacific cod both are nouns.

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

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

cod (noun)	Pacific 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)	Pacific cod (adjective)
payable by the recipient on delivery

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