rigour vs Australian spelling

rigour and Australian spelling both are nouns.

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

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