Australian vs indweller

Australian and indweller both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australian	Yes	Yes	No	No
indweller	Yes	No	No	No

As nouns, indweller is a hypernym of Australian; that is, indweller is a word with a broader meaning than Australian:

Other hypernyms of Australian include denizen, dweller, habitant, inhabitant.

Australian (noun)	indweller (noun)
the Austronesian languages spoken by Australian aborigines	a person who inhabits a particular place
a native or inhabitant of Australia	activation by an inner spirit or force or principle

Australian (adjective)	indweller (adjective)
of or relating to or characteristic of Australia or its inhabitants or its languages