ngay / eyawr

[Ningey]

Kaltxì, ma frapo!

As it seems, there are two words for the same meaning (ngay and eyawr, that is, both meaning "correct", "true", etc.). However, what's the distinction between these two? Right now I'm unable to figure that out, and the dictionaries don't provide any hints to possible connotations.
Anyone who can help?

[Tirea Aean]

ngay means true as in not false, OR real as in not fake.

eyawr means correct as in not incorrect.

EDIT: What is the differnce between Richtig/Falsch and Korrekt/Inkorrekt?

double edit: looks like German holds correct/incorrect and true/false to be more synonymous than I thought. [according to Google Translate] :-/

[Plumps]

I think the primary meaning of those two to be

ngay => wahr
and
eyawr => richtig

tì'eyng angay vs. tì'eyng aeyawr
wahre Antwort vs. richtige Antwort

But as so often there is a grey area

[Ningey]

Do I take it, then, that eyawr is related to actions (doing something the right or wrong way) whereas ngay is related to information (true/false)?

[Tirea Aean]

Do I take it, then, that eyawr is related to actions (doing something the right or wrong way) whereas ngay is related to information (true/false)?

I suppose that is one use of eyawr. Keep in mind though that eyawr is an adjective for use with nouns. Eyawr/keyawr can also be used in such a case:

There are seven seemingly identical items over there. Choose the correct one and you receive a prize. Choose the incorrect one and you may die. Make the correct choice. Etc

Ngay/tsleng is about the validity and truth value of a statement.

[Seze Mune]

In other words, it would not be strictly incorrect to use either word, kefyak?

[Tirea Aean]

it would be ...correct () imo to say that they are similar but not exactly synonymous.

[Seze Mune]

You know, the correct answer to something may not be true.

I could write a completely fictional history.  A questionnaire about the story would have correct answers.  But the answers would not be true.

[`Eylan Ayfalulukanä]

Ngay and its opposite tsleng seem to me to be more objective than eyawr. All three are adjectives, so they would be used to describe a noun in some way. And as Tirea Aean points out, eyawr would be a better choice when there is more possible states involved than the true state and its negation. eyawr would also be a better choice IMHO when trying to address the correctness of a more abstract construct, like a concept of some sort.

Na'vi has a number of words like this, as do almost all other languages.