Australia vs Gulf of Carpentaria

Australia and Gulf of Carpentaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australia	Yes	No	No	No
Gulf of Carpentaria	Yes	No	No	No

Australia (noun)	Gulf of Carpentaria (noun)
a nation occupying the whole of the Australian continent; Aboriginal tribes are thought to have migrated from southeastern Asia 20,000 years ago; first Europeans were British convicts sent there as a penal colony	a wide shallow inlet of the Arafura Sea in northern Australia
the smallest continent; between the South Pacific and the Indian Ocean