motivator vs rational motive

motivator and rational motive both are nouns.

Word	Noun	Adjective	Verb	Adverb
motivator	Yes	No	No	No
rational motive	Yes	No	No	No

As nouns, rational motive is a hypernym of motivator; that is, rational motive is a word with a broader meaning than motivator:

motivator: a positive motivational influence
rational motive: a motive that can be defended by reasoning or logical argument

motivator (noun)	rational motive (noun)
a positive motivational influence	a motive that can be defended by reasoning or logical argument