Commonwealth of Australia vs Simpson Desert

Commonwealth of Australia and Simpson Desert both are nouns.

Word	Noun	Adjective	Verb	Adverb
Commonwealth of Australia	Yes	No	No	No
Simpson Desert	Yes	No	No	No

Commonwealth of Australia (noun)	Simpson Desert (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 desert region of central Australia