fossilise vs British spelling

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

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

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

fossilise (verb)	British spelling (verb)
convert to a fossil
become mentally inflexible