rational vs lucid

rational is a noun but lucid is not a noun.

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

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

rational (adjective)	lucid (adjective)
consistent with or based on or using reason	(of language) transparently clear; easily understandable
capable of being expressed as a quotient of integers	transmitting light; able to be seen through with clarity
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	having a clear mind