Republic of Niger vs Africa

Republic of Niger and Africa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Niger	Yes	No	No	No
Africa	Yes	No	No	No

Republic of Niger (noun)	Africa (noun)
a landlocked republic in West Africa; gained independence from France in 1960; most of the country is dominated by the Sahara Desert	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