Nigeria
geographical name
Ni·ge·ria nī-ˈjir-ē-ə 
country in western Africa which borders on the Gulf of Guinea, is a republic within the Commonwealth of Nations, and was formerly a colony and protectorate; capital Abuja area 356,669 square miles (923,768 square kilometers), population 203,453,000
Note: Nigeria is the most populous country in Africa.
Nigerian
nī-ˈjir-ē-ən
adjective or noun