British spelling vs rigour

British spelling and rigour both are nouns.

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

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