Africa vs Republic of Sierra Leone

Africa and Republic of Sierra Leone both are nouns.

Word	Noun	Adjective	Verb	Adverb
Africa	Yes	No	No	No
Republic of Sierra Leone	Yes	No	No	No

Africa (noun)	Republic of Sierra Leone (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 republic in West Africa; achieved independence from the United Kingdom in 1961