motivator vs incentive

motivator and incentive both are nouns.

Word	Noun	Adjective	Verb	Adverb
motivator	Yes	No	No	No
incentive	Yes	No	No	No

As nouns, motivator and incentive are synonyms defined as:

Other synonyms of motivator include inducement.

motivator (noun)	incentive (noun)
a positive motivational influence	a positive motivational influence
	an additional payment (or other remuneration) to employees as a means of increasing output