improvise vs British spelling

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

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

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

improvise (verb)	British spelling (verb)
perform without preparation
manage in a makeshift way; do with whatever is at hand