Alaskan king crab vs Alaska crab

Alaskan king crab and Alaska crab both are nouns.

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

As nouns, Alaskan king crab and Alaska crab are synonyms defined as:

Alaskan king crab and Alaska crab: large edible crab of northern Pacific waters especially along the coasts of Alaska and Japan

Other synonyms of Alaskan king crab include Alaska king crab, king crab, Paralithodes camtschatica.

As nouns, Alaskan king crab and Alaska crab are synonyms defined as:

Alaskan king crab and Alaska crab: meat of large cold-water crab; mainly leg meat

Other synonyms of Alaskan king crab include Alaska king crab, king crab.

Alaskan king crab (noun)	Alaska 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