vapour vs British spelling

vapour and British spelling both are nouns.

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

vapour (noun)	British spelling (noun)
the process of becoming a vapor	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
a visible suspension in the air of particles of some substance