Australian spelling vs rigour

Australian spelling and rigour both are nouns.

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

Australian spelling (noun)	rigour (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	something hard to endure
	the quality of being valid and rigorous
	excessive sternness