rational vs coherent

rational is a noun but coherent is not a noun.

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

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

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