Austronesian language vs Austronesian

Austronesian language and Austronesian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Austronesian language	Yes	No	No	No
Austronesian	Yes	Yes	No	No

As nouns, Austronesian language and Austronesian are synonyms defined as:

Austronesian language and Austronesian: the family of languages spoken in Australia and Formosa and Malaysia and Polynesia

Austronesian language (noun)	Austronesian (noun)
the family of languages spoken in Australia and Formosa and Malaysia and Polynesia	the family of languages spoken in Australia and Formosa and Malaysia and Polynesia
	a native or inhabitant of Austronesia

Austronesian language (adjective)	Austronesian (adjective)
	of or relating to or characteristic of Austronesia or its people or culture