archaeology vs Australian spelling

archaeology and Australian spelling both are nouns.

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

archaeology (noun)	Australian spelling (noun)
the branch of anthropology that studies prehistoric people and their cultures	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')