secondary vs inessential

secondary and inessential both are nouns.

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

secondary (noun)	inessential (noun)
coil such that current is induced in it by passing a current through the primary coil	anything that is not essential
the defensive football players who line up behind the linemen

secondary (adjective)	inessential (adjective)
being of second rank or importance or value; not direct or immediate	not basic or fundamental
depending on or incidental to what is original or primary	not absolutely necessary
inferior in rank or status
not of major importance
belonging to a lower class or rank