The Tarairiú Nation was divided into several etnies: the Janduí, Kanindé, Payakú (Pajoke, Pajacú, Bajacú), Jenipapo, Jenipapo-Kanindé, Javó, Kamaçu, Takarijú, Ariús, Pêgas, Caratiús, Coremas, Panatís, Paratiós, Piancós, Xukurú among others.
A few words resemble those of neighboring Kariri (and other Macro-Je) and Xukuru languages, but not enough to support a genealogical connection.
Kaufman (1994) reports that "not even Greenberg dares classify this language".
Some of the recorded words: Resemblances with Macro-Jê languages are in kebra 'stone' (Proto-Je *kɛn), kreká 'head' (*krã), koreké 'hand' (*-ĩkra), and poyá 'foot' (*par).
An alternative list of Tarairiú words compared with "Jê" dialects and Cariri, compiled by the Paraíba historian José Elias Barbosa Borges, is given in Medeiros (1999):[4]