The Mura-Matanawàlanguages are a proposed language grouping consisting of the Mura language (with the Pirahã dialect) and extinct MatanawÃÂ. Glottolog evaluates it as "promising" but does not rule out chance for the similarities. The family was first proposed by Curt Nimuendajú in 1922.
For the Mura-Matanawi languages, Jolkesky (2016) notes that there are lexical similarities with the Kwaza, Taruma, Katukina-Katawixi, Arawak, Jeoromitxi, Tupi, and Arawa language families due to contact.
Comparison of basic vocabulary in Matanawàand Mura-Pirahã by Diego Valio Antunes Alves (2019: 86), with data of both languages cited from Curt Nimuendajú (1925):