What language did Jack learn in the movie "Avatar"?

Na'vi language, Na'vi language, is a language deliberately designed for this movie. It was specially created by linguists and does not exist in real life. . However, this language has a relatively detailed grammar, and currently there are nearly 1,000 words.

If Avatar 2 is filmed, more words will be created

Similarly, Lord of the Rings and Interstellar all have their own language. If the vitality of the movie is strong, this language will eventually slowly When enriched, like in Lord of the Rings, using Elvish language in daily life is not a big problem