rational vs ratio

rational and ratio both are nouns.

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

rational (noun)	ratio (noun)
an integer or a fraction	the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree
	the relative magnitudes of two quantities (usually expressed as a quotient)

rational (adjective)	ratio (adjective)
consistent with or based on or using reason
capable of being expressed as a quotient of integers
having its source in or being guided by the intellect (as distinguished from experience or emotion)
of or associated with or requiring the use of the mind