low-level vs secondary

low-level is not a noun while secondary is a noun.

Word	Noun	Adjective	Verb	Adverb
low-level	No	Yes	No	No
secondary	Yes	Yes	No	No

low-level (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

low-level (adjective)	secondary (adjective)
lower in rank or importance	being of second rank or importance or value; not direct or immediate
at a low level in rank or importance	depending on or incidental to what is original or primary
occurring at a relatively low altitude	inferior in rank or status
not intense	not of major importance
	belonging to a lower class or rank