incentive vs motivator

incentive and motivator both are nouns.

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

As nouns, incentive and motivator are synonyms defined as:

Other synonyms of incentive include inducement.

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