kick start vs kick starter

kick start and kick starter both are nouns.

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

As nouns, kick start and kick starter are synonyms defined as:

kick start and kick starter: a starter (as on a motorcycle) that is activated with the foot and the weight of the body

kick start (noun)	kick starter (noun)
a starter (as on a motorcycle) that is activated with the foot and the weight of the body	a starter (as on a motorcycle) that is activated with the foot and the weight of the body