Horn of Africa vs Africa

Horn of Africa and Africa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Horn of Africa	Yes	No	No	No
Africa	Yes	No	No	No

Horn of Africa (noun)	Africa (noun)
a peninsula of northeastern Africa (the easternmost part of Africa) comprising Somalia and Djibouti and Eritrea and parts of Ethiopia	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