rigour vs British spelling

rigour and British spelling both are nouns.

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

rigour (noun)	British spelling (noun)
something hard to endure	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
the quality of being valid and rigorous
excessive sternness