Common Turkic or Shaz Turkic is a taxon

Taxon

|thumb|270px|[[African elephants]] form a widely-accepted taxon, the [[genus]] LoxodontaA taxon is a group of organisms, which a taxonomist adjudges to be a unit. Usually a taxon is given a name and a rank, although neither is a requirement...

 in some of the classifications of the Turkic languages

Turkic languages

The Turkic languages constitute a language family of at least thirty five languages, spoken by Turkic peoples across a vast area from Eastern Europe and the Mediterranean to Siberia and Western China, and are considered to be part of the proposed Altaic language family.Turkic languages are spoken...

 which in Lars Johanson proposal contain the following subgroups:. In other classification schemes (A.Samoylovich

Alexander Samoylovich

Alexander Nikolaevich Samoylovich was an important Russian Orientalist-Turkologist, academician of USSR Academy of Sciences , Rector of Leningrad Oriental Institute , academic secretary of Humanities Branch of USSR Academy of Sciences , director of the Institute of Oriental Studies of the USSR...

, N.Baskakov

Nikolay Baskakov

Nikolay Aleksandrovich Baskakov was a Russian Turkologist, linguist, and ethnologist. He created a systematization model of the Turkic language family , and studied Turkic-Russian contacts in the 10-11th centuries CE. During 64 years of scientific work , N.A.Baskakov published almost 640 works...

, and others), the breakdown is different.

• Southwestern Common Turkic (Oghuz)
  Oghuz languages
  The Oghuz languages, a major branch of the Turkic language family, are spoken by more than 110 million people in an area spanning from the Balkans to China.-Linguistic features:...
  
  
• Northwestern Common Turkic (Kipchak)
  Kypchak languages
  The Kypchak languages , are a major branch of the Turkic language family spoken by more than 12 million people in an area spanning from Lithuania to China....
  
  
• Southeastern Common Turkic (Uyghuric)
• Northeastern Common Turkic (Siberian)

In that classification scheme, Common Turkic is opposed to Oghur Turkic

Oghur languages

The Oghur or Bulgar , are a separate branch of the Turkic language family. It was historically spoken in Volga Bulgaria...

or Lir-Turkic. The Common Turkic languages are characterized by sound correspondences such as Common Turkic š versus Oghuric

Oghur languages

The Oghur or Bulgar , are a separate branch of the Turkic language family. It was historically spoken in Volga Bulgaria...

 l and Common Turkic z versus Oghuric

Oghur languages

The Oghur or Bulgar , are a separate branch of the Turkic language family. It was historically spoken in Volga Bulgaria...

r.