aesthetics vs Australian spelling

aesthetics and Australian spelling both are nouns.

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

aesthetics (noun)	Australian spelling (noun)
(art) the branch of philosophy dealing with beauty and taste (emphasizing the evaluative criteria that are applied to art)	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')