Yes
The noun 'rational' is a singular, common noun; a word for a number that can be written as a fraction or a ratio (rational number); a word for a thing.The word 'rational' is also an adjective.
Rationalize is a verb.
The word "lucid" is an adjective. It is used to describe something clear, easily understood, or rational.
No. Rational is an adjective. The adverb form is rationally.
Rational
"Rational" is an adjective and so there cannot be "a rational" (and certainly not "an rational"). Any answer would depend on whether the question was about a rational number, a rational person, a rational argument or "a rational" combined with some other noun.
it has the word rational in it
It is an adjective.It is a an adjective.
A word is a thing. The word 'word' is a noun.
The word beautiful is an adjective.
no it is not an adjective
The word this is a demonstrative adjective.