secondary vs incident

secondary and incident both are nouns.

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

secondary (noun)	incident (noun)
coil such that current is induced in it by passing a current through the primary coil	a single distinct event
the defensive football players who line up behind the linemen	a public disturbance

secondary (adjective)	incident (adjective)
being of second rank or importance or value; not direct or immediate	(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
depending on or incidental to what is original or primary	falling or striking of light rays on something
inferior in rank or status
not of major importance
belonging to a lower class or rank