Alaska king crab vs Alaska king crab

Alaska king crab and Alaska king crab both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alaska king crab	Yes	No	No	No
Alaska king crab	Yes	No	No	No

Alaska king crab (noun)	Alaska king crab (noun)
large edible crab of northern Pacific waters especially along the coasts of Alaska and Japan	large edible crab of northern Pacific waters especially along the coasts of Alaska and Japan
meat of large cold-water crab; mainly leg meat	meat of large cold-water crab; mainly leg meat