Saudi Arabia vs Syrian Desert

Saudi Arabia and Syrian Desert both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saudi Arabia	Yes	No	No	No
Syrian Desert	Yes	No	No	No

Saudi Arabia (noun)	Syrian Desert (noun)
an absolute monarchy occupying most of the Arabian Peninsula in southwest Asia; vast oil reserves dominate the economy	a desert of northern Arabia occupying western Iraq, southern Syria, eastern Jordan, and northern Saudi Arabia