Commonwealth of Australia vs Great Barrier Reef

Commonwealth of Australia and Great Barrier Reef both are nouns.

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

Commonwealth of 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