British spelling vs specialise

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

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

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

British spelling (verb)	specialise (verb)
	become more focused on an area of activity or field of study
	suit to a special purpose
	evolve so as to lead to a new species or develop in a way most suited to the environment
	be specific about
	devote oneself to a special area of work