navi1-1  Exercise 2: Origin and Spelling
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Who and why
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Na'vi was made by the linguist Paul Frommer, hired by James Cameron's
production team to build a language for the people of Pandora in the film
Avatar (2009). Cameron had written about thirty words; Frommer built the
sounds, word-building rules and grammar around them. The purpose is
dramatic: a language that sounds right in actors' mouths and does not sound
like English.

A priori or a posteriori?
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A priori. It is built from scratch, not from the words of an existing
language. (An a posteriori language, such as Esperanto, borrows its words
from natural languages.)

Which could not be Na'vi?
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  bado    NOT Na'vi: it has b and d, and Na'vi has no b, d or g.
  txon    possible: tx is one of the ejectives (a popped t).
  kela    possible: only letters that Na'vi uses.
  giga    NOT Na'vi: it has g, and Na'vi has no g.

(Whether a possible-looking word actually exists is a separate question;
here we only test the letters, as Chapter 2 will do in more detail.)