vice president vs vice-presidential

vice president is a noun but vice-presidential is not a noun.

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

vice president (noun)	vice-presidential (noun)
an executive officer ranking immediately below a president; may serve in the president's place under certain circumstances

vice president (adjective)	vice-presidential (adjective)
	relating to a vice president or vice-presidency