choice vs alternative

choice and alternative both are nouns.

Word	Noun	Adjective	Verb	Adverb
choice	Yes	Yes	No	No
alternative	Yes	Yes	No	No

As nouns, choice and alternative are synonyms defined as:

choice and alternative: one of a number of things from which only one can be chosen

Other synonyms of choice include option.

choice (noun)	alternative (noun)
the act of choosing or selecting	one of a number of things from which only one can be chosen
the person or thing chosen or selected
one of a number of things from which only one can be chosen

choice (adjective)	alternative (adjective)
of superior grade	necessitating a choice between mutually exclusive possibilities
appealing to refined taste	serving or used in place of another
	pertaining to unconventional choices