Guamo
Guamo was a language isolate once spoken in Venezuela.
An isolate: no relationship to any other known language has been demonstrated.
Guamo (a.k.a. Wamo or Guamotey) is an extinct language of Venezuela. Kaufman (1990) finds a connection with the Chapacuran languages convincing.
From Wikipedia · Guamo language · CC BY-SA 4.0