Africa vs Republic of Chad

Africa and Republic of Chad both are nouns.

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

Africa (noun)	Republic of Chad (noun)
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	a landlocked desert republic in north-central Africa; was under French control until 1960