encyclopaedia vs Australian spelling

encyclopaedia and Australian spelling both are nouns.

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

encyclopaedia (noun)	Australian spelling (noun)
a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')