The Guaraní languages are a group of half a dozen or so languages in the Tupí–Guaraní language family. The best known language in this family is Guaraní

Guaraní language

Guaraní, specifically the primary variety known as Paraguayan Guaraní , is an indigenous language of South America that belongs to the Tupí–Guaraní subfamily of the Tupian languages. It is one of the official languages of Paraguay , where it is spoken by the majority of the population, and half of...

, the national language of Paraguay

Paraguay

Paraguay , officially the Republic of Paraguay , is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to the east and northeast, and Bolivia to the northwest. Paraguay lies on both banks of the Paraguay River, which runs through the center of the...

.

The Guaraní languages are:

• Guaraní dialect chain: Western Bolivian Guaraní
  Western Bolivian Guaraní
  Western Bolivian Guaraní, known locally as Simba and Simba Guaraní, is a Guaraní language spoken in Bolivia, in the Chuquisaca Department north of the Pilcomayo River....
  
   (Simba), Eastern Bolivian Guaraní
  Eastern Bolivian Guaraní
  Eastern Bolivian Guaraní, known locally as Chawuncu or Chiriguano, is a Guaraní language spoken in South America. In Bolivia 33,670 speakers were counted in the year 2000, in the south-central Parapeti River area and in the city of Tarija...
  
   (Chawuncu; Ava, Tapieté dialects), Paraguayan Guaraní
  Paraguayan guaraní
  The guaraní is the national currency unit of Paraguay. The guaraní was divided into 100 céntimos but, because of inflation, céntimos are no longer in use.The currency sign is .-History:...
  
   (Guarani), Chiripá Guaraní (Nhandéva, Avá), Mbyá Guaraní
  Mbyá Guaraní
  Mbyá Guaraní is a Tupi–Guaraní language spoken 16,050 Brazilians, 3,000 Argentines, and 8,000 Paraguayans. It is 75% lexically similar to Paraguayan Guaraní.Mbyá Guaraní is one of a number of "Guaraní dialects" now generally classified as distinct languages....
  
   (Mbya)
• ? Kaiwá (Paí Tavyterá dialect)
• Aché
  Aché language
  Aché, also known as Guayaki, is a Guarani language of Paraguay. The six Aché dialects are distinct enough to cause some problems with communication....
  
   (Guayaki) (several dialects)
• ? Xetá

The varieties of Guaraní proper and Kaiwá have limited mutual intelligibility. Aché and Guaraní are not mutually intelligible.http://books.google.com/books?id=_2ZQUncZuosC&pg=PA41&dq=Ache+Guarani&as_brr=3#v=onepage&q=Ache%20Guarani&f=false The position of Xetá is unclear.