Quechumaran is a language-family proposal that unites Quechua

Quechua languages

Quechua is a Native South American language family and dialect cluster spoken primarily in the Andes of South America, derived from an original common ancestor language, Proto-Quechua. It is the most widely spoken language family of the indigenous peoples of the Americas, with a total of probably...

 and Aymara

Aymara

The Aymara or Aimara are an indigenous ethnic group in the Andes and Altiplano regions of South America; about 2 million live in Bolivia, Peru and Chile...

. Quechuan languages, especially those of the south, share a large amount of vocabulary with Aymara. Kaufman

Terrence Kaufman

Terrence Kaufman is an American linguist specializing in documentation of unwritten languages, Mesoamerican historical linguistics and language contact phenomena. He is currently a professor at the department of anthropology at the University of Pittsburgh....

  finds the proposal reasonably convincing, but Wlillem Adelaar, a Quechua

Quechua languages

Quechua is a Native South American language family and dialect cluster spoken primarily in the Andes of South America, derived from an original common ancestor language, Proto-Quechua. It is the most widely spoken language family of the indigenous peoples of the Americas, with a total of probably...

 specialist believes the similarities to be due to borrowing during long-term contact. Lyle Campbell

Lyle Campbell

Lyle Richard Campbell is a linguist and leading expert on indigenous American languages—especially those of Mesoamerica—and on historical linguistics in general. He also has expertise in Uralic languages. He is presently Professor of Linguistics at the University of Hawaii at Manoa.-Life and...

suspects that the proposal is valid, but does not consider it to have been conclusively proven.