Sinai vs Sinai Peninsula

Sinai and Sinai Peninsula both are nouns.

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

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

Sinai and Sinai Peninsula: a peninsula in northeastern Egypt; at north end of Red Sea

Sinai (noun)	Sinai Peninsula (noun)
a peninsula in northeastern Egypt; at north end of Red Sea	a peninsula in northeastern Egypt; at north end of Red Sea
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