der Nigerianer
Nigerian man
A male person who has Nigerian citizenship or comes from Nigeria.
Mein neuer Kollege ist Nigerianer und lebt seit fünf Jahren in Deutschland.
My new colleague is Nigerian and has been living in Germany for five years.

Nigerian
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Nigerian man
A male person who has Nigerian citizenship or comes from Nigeria.
Mein neuer Kollege ist Nigerianer und lebt seit fünf Jahren in Deutschland.
My new colleague is Nigerian and has been living in Germany for five years.

The word is derived from the country name 'Nigeria.' The ending '-aner' is a typical ending for male inhabitants of countries or continents.
Er ist Nigerianer und kommt aus der Stadt Lagos.
He is Nigerian and comes from the city of Lagos.
This noun belongs to the N-declension. This means that it takes an '-n' at the end in all cases except the nominative singular. A common mistake is forgetting this '-n.'
Ich habe gestern mit einem Nigerianer gesprochen.
I spoke with a Nigerian yesterday.
The adjective used to describe things that come from Nigeria or relate to the country is 'nigerianisch' (Nigerian). It is declined like any other adjective.
Die nigerianische Fußballmannschaft hat das Spiel gewonnen.
The Nigerian football team won the match.