alternative vs secondary

alternative and secondary both are nouns.

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

alternative (noun)	secondary (noun)
one of a number of things from which only one can be chosen	coil such that current is induced in it by passing a current through the primary coil
	the defensive football players who line up behind the linemen

alternative (adjective)	secondary (adjective)
necessitating a choice between mutually exclusive possibilities	being of second rank or importance or value; not direct or immediate
serving or used in place of another	depending on or incidental to what is original or primary
pertaining to unconventional choices	inferior in rank or status
	not of major importance
	belonging to a lower class or rank