unalterable vs final

unalterable is not a noun while final is a noun.

Word	Noun	Adjective	Verb	Adverb
unalterable	No	Yes	No	No
final	Yes	Yes	No	No

unalterable (noun)	final (noun)
	an examination administered at the end of an academic term
	the final match between the winners of all previous matches in an elimination tournament

unalterable (adjective)	final (adjective)
not capable of being changed or altered	occurring at or forming an end or termination
of a sentence; that cannot be changed	conclusive in a process or progression
remaining the same for indefinitely long times	not to be altered or undone