lucid vs rational

lucid is not a noun while rational is a noun.

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

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

lucid (adjective)	rational (adjective)
(of language) transparently clear; easily understandable	consistent with or based on or using reason
transmitting light; able to be seen through with clarity	capable of being expressed as a quotient of integers
capable of thinking and expressing yourself in a clear and consistent manner	having its source in or being guided by the intellect (as distinguished from experience or emotion)
having a clear mind	of or associated with or requiring the use of the mind