Alaska vs Last Frontier

Alaska and Last Frontier both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alaska	Yes	No	No	No
Last Frontier	Yes	No	No	No

As nouns, Alaska and Last Frontier are synonyms defined as:

Alaska and Last Frontier: a state in northwestern North America; the 49th state admitted to the union

Other synonyms of Alaska include AK.

Alaska (noun)	Last Frontier (noun)
a state in northwestern North America; the 49th state admitted to the union	a state in northwestern North America; the 49th state admitted to the union