optimize vs optimum

optimize is not a noun while optimum is a noun.

Word	Noun	Adjective	Verb	Adverb
optimize	No	No	Yes	No
optimum	Yes	Yes	No	No

optimize (noun)	optimum (noun)
	most favorable conditions or greatest degree or amount possible under given circumstances

optimize (adjective)	optimum (adjective)
	most desirable possible under a restriction expressed or implied

optimize (verb)	optimum (verb)
act as an optimist and take a sunny view of the world
make optimal; get the most out of; use best
modify to achieve maximum efficiency in storage capacity or time or cost