Peba–Yaguan languages
The Peba–Yaguan language family (also Yaguan, Peban, Yáwan) is located in the northwestern Amazon, but today Yagua is the only remaining spoken language of the family.

Internal structure
Paul Rivet had suggested that the Peba–Yaguan family divided into two branches, with Yameo in one branch, and Peba and Yagua in the other.  There is extremely little documentation of Yameo and Peba, both of which are now extinct, though the town Pebas on the Amazon River clearly takes its name from this group of people. The available documentation is largely due to the efforts of early Catholic missionaries, summarized by Paul Rivet.

Loukotka (1968) also lists Masamae (Mazán, Parara), spoken the Mazán River in Loreto Department, Peru. It is most closely related to Yameo.

Jolkesky (2016) groups Peba and Yameo in one branch, and Yagua in another separate branch.

Classification
There is no sound scientific evidence yet that the Peba–Yaguan family is related to any other family or stock of South America (in particular, there is no evidence for grouping it with Cariban languages). There has likely been contact between the Yaguas and Bora–Witotoan peoples, perhaps particularly during the era of the rubber-trade; this may account for some structural similarities between the languages (Payne, forthcoming). Kaufman (2007) includes Sabela, Taushiro, and Omurano in his Yawan family.

Language contact
Jolkesky (2016) notes that there are lexical similarities with the Kwaza, Zaparoan, and Nambikwaran language families due to contact.

Vocabulary
Loukotka (1968) lists the following basic vocabulary items.

{| class="wikitable sortable"
! gloss !! Yagua !! Peba !! Yameo !! Masamae
|-
! one
| tékí || tomätaira || pwitér || poetinten
|-
! two
| nanoxõ || monomoira || narámue || 
|-
! three
| mungoá || tamoimansa || pwiterorineo || 
|-
! head
| ori-nó || rai-no || wi-nátu || nato
|-
! ear
| o-tsiwá || mi-tiwa || wi-tíwẽ || 
|-
! tooth
| o-xaná || vi-ala || wi-é || 
|-
! man
| wánu || komoley || awára || 
|-
! fire
| [h]ená || föla || óle || aule
|-
! sun
| iñi || remelané || natéra || raitará
|-
! earth
| mokané || kapalé || pópo || popo
|-
! maize
| lelú || lolú || ogung || 
|-
! tapir
| nechá || ameisha || náse || 
|}

Further reading
Powlison, P. (1995). Diccionario Yagua - Castellano. (Serie Lingüística Peruana, 35). Lima: Ministerio de Educación and Summer Institute of Linguistics.

References

 Payne, Doris L. forthcoming. Source of the Yagua classifier system.
 Catholic Encyclopedia article

 
Language families