Australian vs habitant

Australian and habitant both are nouns.

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

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

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

Australian (noun)	habitant (noun)
the Austronesian languages spoken by Australian aborigines	a person who inhabits a particular place
a native or inhabitant of Australia

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