kick start vs starter motor

kick start and starter motor both are nouns.

Word	Noun	Adjective	Verb	Adverb
kick start	Yes	No	No	No
starter motor	Yes	No	No	No

As nouns, starter motor is a hypernym of kick start; that is, starter motor is a word with a broader meaning than kick start:

kick start: a starter (as on a motorcycle) that is activated with the foot and the weight of the body
starter motor: an electric motor for starting an engine

Other hypernyms of kick start include starter, starting motor.

kick start (noun)	starter motor (noun)
a starter (as on a motorcycle) that is activated with the foot and the weight of the body	an electric motor for starting an engine