optimise vs British spelling

optimise is not a noun while British spelling is a noun.

Word	Noun	Adjective	Verb	Adverb
optimise	No	No	Yes	No
British spelling	Yes	No	No	No

optimise (noun)	British spelling (noun)
	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')

optimise (verb)	British spelling (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