Keeping this in view, who is the native speaker?
: a person who learned to speak the language of the place where he or she was born as a child rather than learning it as a foreign language a native speaker of Swahili That kind of mistake is rarely made by native speakers.
Secondly, is Nigeria a native speaker of English? Yes. Nigeria is an English speaking country. Nigeria was colonized by the and a British protectorate from 1901 to 1960. Nigeria had local languages before the Brits got here.
Likewise, what is considered a native Spanish speaker?
Native speakers have learned a language from their family. A high school student who has just moved to the United States from a Spanish speaking country is a native speaker of Spanish. They have learned Spanish from both family and the society in which they live/lived in.
Is it OK to say native speaker?
I can't say it's "incorrect", but it's certainly a poor choice. Calling someone "a native" can be interpreted as conflating the place you were born with the language you spoke from birth. I recommend always using the phrase native speaker, and if you want to specify what language, writing out native speaker of English.
