presidential vs president

presidential is not a noun while president is a noun.

Word	Noun	Adjective	Verb	Adverb
presidential	No	Yes	No	No
president	Yes	No	No	No

presidential (noun)	president (noun)
	the chief executive of a republic
	an executive officer of a firm or corporation
	the head administrative officer of a college or university
	the officer who presides at the meetings of an organization

presidential (adjective)	president (adjective)
befitting a president
relating to a president or presidency