Nigeria, Gabon, and CHAD are all neighbors of Cameroon. Nigeria is a 7-letter word, Gabon is a 5-letter word, and CHAD is a 4-letter word. Nigeria is the most populous country in Africa and is located in West Africa. Gabon is a Central African country located on the Atlantic coast. CHAD is a landlocked country located in North-Central Africa. All three countries border Cameroon, making them its neighbors.