Aboriginal Australian vs Australian

Aboriginal Australian and Australian both are nouns.

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

As nouns, Aboriginal Australian and Australian are synonyms defined as:

Aboriginal Australian and Australian: the Austronesian languages spoken by Australian aborigines

Other synonyms of Aboriginal Australian include Aboriginal Australian language, Australian language.

Aboriginal Australian (noun)	Australian (noun)
the Austronesian languages spoken by Australian aborigines	the Austronesian languages spoken by Australian aborigines
	a native or inhabitant of Australia

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