secondary vs transformer

secondary and transformer both are nouns.

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

secondary (noun)	transformer (noun)
coil such that current is induced in it by passing a current through the primary coil	an electrical device by which alternating current of one voltage is changed to another voltage
the defensive football players who line up behind the linemen

secondary (adjective)	transformer (adjective)
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