Australian language vs Aboriginal Australian

Australian language and Aboriginal Australian both are nouns.

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

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

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

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

Australian language (noun)	Aboriginal Australian (noun)
the Austronesian languages spoken by Australian aborigines	the Austronesian languages spoken by Australian aborigines