Australian spelling vs diarrhoea

Australian spelling and diarrhoea both are nouns.

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

Australian spelling (noun)	diarrhoea (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	frequent and watery bowel movements; can be a symptom of infection or food poisoning or colitis or a gastrointestinal tumor