Simpson Desert vs desert

Simpson Desert and desert both are nouns.

Word	Noun	Adjective	Verb	Adverb
Simpson Desert	Yes	No	No	No
desert	Yes	No	Yes	No

Simpson Desert (noun)	desert (noun)
a desert region of central Australia	arid land with little or no vegetation
	(usually plural) a person's deservingness of or entitlement to reward or punishment

Simpson Desert (verb)	desert (verb)
	leave someone who needs or counts on you; leave in the lurch
	leave behind
	desert (a cause, a country or an army), often in order to join the opposing cause, country, or army