Australian spelling vs caesium

Australian spelling and caesium both are nouns.

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

Australian spelling (noun)	caesium (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal