Aboriginal Australian vs Australian language

Aboriginal Australian and Australian language both are nouns.

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

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

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

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

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