hypothesise vs British spelling

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

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

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

hypothesise (verb)	British spelling (verb)
to believe especially on uncertain or tentative grounds