transformer vs primary coil

transformer and primary coil both are nouns.

Word	Noun	Adjective	Verb	Adverb
transformer	Yes	No	No	No
primary coil	Yes	No	No	No

transformer (noun)	primary coil (noun)
an electrical device by which alternating current of one voltage is changed to another voltage	coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit