intelligent vs rational

intelligent is not a noun while rational is a noun.

Word	Noun	Adjective	Verb	Adverb
intelligent	No	Yes	No	No
rational	Yes	Yes	No	No

intelligent (noun)	rational (noun)
	an integer or a fraction

intelligent (adjective)	rational (adjective)
having the capacity for thought and reason especially to a high degree	consistent with or based on or using reason
endowed with the capacity to reason	capable of being expressed as a quotient of integers
exercising or showing good judgment	having its source in or being guided by the intellect (as distinguished from experience or emotion)
possessing sound knowledge	of or associated with or requiring the use of the mind