Sahara vs Africa

Sahara and Africa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sahara	Yes	No	No	No
Africa	Yes	No	No	No

Sahara (noun)	Africa (noun)
the world's largest desert (3,500,000 square miles) in northern Africa	the second largest continent; located to the south of Europe and bordered to the west by the South Atlantic and to the east by the Indian Ocean