Australian spelling vs water vapour

Australian spelling and water vapour both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australian spelling	Yes	No	No	No
water vapour	Yes	No	No	No

Australian spelling (noun)	water vapour (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	water in a vaporous form diffused in the atmosphere but below boiling temperature