supreme vs maximum

supreme is not a noun while maximum is a noun.

Word	Noun	Adjective	Verb	Adverb
supreme	No	Yes	No	No
maximum	Yes	Yes	No	No

supreme (noun)	maximum (noun)
	the greatest possible degree
	the point on a curve where the tangent changes from positive on the left to negative on the right
	the largest possible quantity

supreme (adjective)	maximum (adjective)
greatest in status or authority or power	the greatest or most complete or best possible
greatest or maximal in degree; extreme
highest in excellence or achievement
final or last in your life or progress