Australian spelling vs tumour

Australian spelling and tumour both are nouns.

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

Australian spelling (noun)	tumour (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	an abnormal new mass of tissue that serves no purpose