British spelling vs decolonise

British spelling is a noun but decolonise is not a noun.

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

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

British spelling (verb)	decolonise (verb)
	grant independence to (a former colony)