maximise vs maximum

maximise is not a noun while maximum is a noun.

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

maximise (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

maximise (adjective)	maximum (adjective)
	the greatest or most complete or best possible

maximise (verb)	maximum (verb)
make as big or large as possible
make the most of