fantasise vs British spelling

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

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

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

fantasise (verb)	British spelling (verb)
indulge in fantasies
portray in the mind