rotor coil vs rotor

rotor coil and rotor both are nouns.

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

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

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