Sinai vs Sinai Desert

Sinai and Sinai Desert both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sinai	Yes	No	No	No
Sinai Desert	Yes	No	No	No

As nouns, Sinai and Sinai Desert are synonyms defined as:

Sinai and Sinai Desert: a desert on the Sinai Peninsula in northeastern Egypt

Sinai (noun)	Sinai Desert (noun)
a peninsula in northeastern Egypt; at north end of Red Sea	a desert on the Sinai Peninsula in northeastern Egypt
a desert on the Sinai Peninsula in northeastern Egypt
a mountain peak in the southern Sinai Peninsula (7,500 feet high); it is believed to be the peak on which Moses received the Ten Commandments