This is the 8070th most frequent Polish word.
nigeria
In Polish, "Nigeria" refers to the country Nigeria in West Africa.
Nigeria is used here as a proper noun, the name of a country.
Nigeria jest krajem w Afryce.
Nigeria is a country in Africa.
Nigeria is used here as a noun to specify the origin related to the country.
Kultura Nigerii jest bardzo różnorodna.
The culture of Nigeria is very diverse.
Nigeria defines the source/origin of the products, used in complement with the preposition.