institutionalise vs British spelling

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

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

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

institutionalise (verb)	British spelling (verb)
cause to be admitted; of persons to an institution