Dialects
Hiri Motu has two dialects, called Austronesian and Papuan. Both dialects are of course Austronesian in both grammar and vocabulary due to their original derivation − the dialect names refer to the "first languages" spoken by users of this lingua franca. The Papuan dialect (also called "Non-central") was in the language's heyday much more widely spoken, and was, at least from about 1964, used as the standard for official publications: but the Austronesian (or "Central") dialect is closer to Motu in grammar and phonology, and its vocabulary is both more extensive, and also closer to the "original" language. It tended, for this reason, to have a much higher status, and was regarded by almost all speakers as more "correct".
Read more about this topic: Hiri Motu Language