rotor vs rotor coil

rotor and rotor coil both are nouns.

Word	Noun	Adjective	Verb	Adverb
rotor	Yes	No	No	No
rotor coil	Yes	No	No	No

As nouns, rotor and rotor coil are synonyms defined as:

rotor (noun)	rotor coil (noun)
rotating mechanism consisting of an assembly of rotating airfoils	the rotating armature of a motor or generator
the rotating armature of a motor or generator
the revolving bar of a distributor