Alaska king crab vs Alaskan king crab

Alaska king crab and Alaskan king crab both are nouns.

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

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

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

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

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

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

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

Alaska king crab (noun)	Alaskan 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