secondary vs auxiliary

secondary and auxiliary both are nouns.

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

secondary (noun)	auxiliary (noun)
coil such that current is induced in it by passing a current through the primary coil	someone who acts as assistant
the defensive football players who line up behind the linemen

secondary (adjective)	auxiliary (adjective)
being of second rank or importance or value; not direct or immediate	functioning in a supporting capacity
depending on or incidental to what is original or primary	furnishing added support
inferior in rank or status
not of major importance
belonging to a lower class or rank