armature vs rotor

armature and rotor both are nouns.

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

As nouns, rotor is a hyponym of armature; that is, rotor is a word with a more specific, narrower meaning than armature:

armature: coil in which voltage is induced by motion through a magnetic field
rotor: the rotating armature of a motor or generator

Other hyponyms of armature include rotor coil.

armature (noun)	rotor (noun)
coil in which voltage is induced by motion through a magnetic field	rotating mechanism consisting of an assembly of rotating airfoils
	the rotating armature of a motor or generator
	the revolving bar of a distributor