Orkish

Orkish was a general term for the jumble of languages used by the Orcs, composed from corrupted borrowings from other languages of Middle-earth. The variations in Orkish between different tribes and types of Orc were so great that it was often useless for communication, and so a standard language was necessary. Sauron devised his Black Speech for this purpose in Mordor, but in practice the Common Tongue was more normally used.

It is said that it was Morgoth who invented the speech for the Orcs in the first place, thus relating to an earlier concept of Melkian family of tongues.