It said black students spoke a separate language called ebonics.
It is, in fact, not a separate language at all.
Sylheti is also considered by some to be a separate language.
It is the last which is generally the one considered a separate language.
He concluded these are separate languages of the same family.
After long studies in 1969 it was declared a separate language.
These areas may have a separate language, culture and economic system.
Some linguists consider it a separate language because of this.
Popular music has a separate language now, with many fewer words in common.
I don't think a linguist would call it a separate language from English.