maximum vs maximise

maximum is a noun but maximise is not a noun.

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

maximum (noun)	maximise (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

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

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