Africa vs Horn of Africa

Africa and Horn of Africa both are nouns.

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

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