British spelling vs fertilise

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

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

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

British spelling (verb)	fertilise (verb)
	introduce semen into (a female)
	provide with fertilizers or add nutrients to
	make fertile or productive