Warao appears to be a language isolate, unrelated to any recorded language in the region or elsewhere. Terrence Kaufman (1994) included it in his hypothetical Macro-Paezan family, but the necessary supporting work was never done. Julian Granberry connected many of the grammatical forms, including nominal and verbal suffixes, of Warao to the Timucua language of north Florida, also a language isolate, suggesting creolization as a possible explanation for these similarities.
There are "Waroid" vocabulary items in Guajiro (from toponymic evidence it seems that the Warao or a related people once occupied Goajiro country) and in Taino (nuçay/nozay [nosái] "gold" in Ciboney — cf. Warao naséi símo "gold" (lit. "yellow pebble") — and duho "ceremonial stool" in Classic Taino — cf. Warao duhu "sit, stool"). Granberry & Vescelius (2004) note that toponymic evidence suggests that the pre-Taino Macorix language of Hispaniola and Guanahatabey language of Cuba may have been Waroid languages as well.