secondary vs alternative

secondary and alternative both are nouns.

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

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

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