Last Frontier vs AK

Last Frontier and AK both are nouns.

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

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

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

Other synonyms of Last Frontier include Alaska.

Last Frontier (noun)	AK (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