Australia vs Great Barrier Reef

Australia and Great Barrier Reef both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australia	Yes	No	No	No
Great Barrier Reef	Yes	No	No	No

Australia (noun)	Great Barrier Reef (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	the largest coral reef in the world; in the Coral Sea off the northeastern coast of Australia
the smallest continent; between the South Pacific and the Indian Ocean