British spelling vs prioritise

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

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

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

British spelling (verb)	prioritise (verb)
	assign a priority to