unessential vs secondary

unessential is not a noun while secondary is a noun.

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

unessential (noun)	secondary (noun)
	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

unessential (adjective)	secondary (adjective)
not basic or fundamental	being of second rank or importance or value; not direct or immediate
	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