auxiliary vs secondary

auxiliary and secondary both are nouns.

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

auxiliary (noun)	secondary (noun)
someone who acts as assistant	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

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