coherent vs rational

coherent is not a noun while rational is a noun.

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

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

coherent (adjective)	rational (adjective)
marked by an orderly, logical, and aesthetically consistent relation of parts	consistent with or based on or using reason
(physics) of waves having a constant phase relation	capable of being expressed as a quotient of integers
sticking together	having its source in or being guided by the intellect (as distinguished from experience or emotion)
capable of thinking and expressing yourself in a clear and consistent manner	of or associated with or requiring the use of the mind