However, depending on the context, you could consider these alternatives:
* Diné: This is the Navajo word for "Navajo people." It's not an antonym, but it could be used to represent the opposite of "Bilagaana" in a cultural or tribal context.
* T'áá díkwíí: This means "someone else" or "other people" and could be used in situations where you need to distinguish "Bilagaana" from a specific group of people.
* Naakits'áád: This means "Mexican" or "Hispanic." While not an antonym, it could be used in a context where "Bilagaana" specifically refers to people of European origin.
It's important to remember that the Navajo language is rich in cultural nuances and context is crucial when choosing the most appropriate word.