Last Frontier vs Alaska

Last Frontier and Alaska both are nouns.

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

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

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

Other synonyms of Last Frontier include AK.

Last Frontier (noun)	Alaska (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