Do Apêndice do Senhor dos Anéis F:
And these creatures, being filled with malice, hating even their own kind, quickly developed as many barbarous dialects as there were groups or settlements of their race, so that their Orkish speech was of little use to them in intercourse between different tribes.
So it was that in the Third Age Orcs used for communication between breed and breed the Westron tongue...
Portanto, não há uma única língua órquica .
A situação nos filmes do SdA é consistente com isso, porque - se você verificar as cenas do filme novamente - você verá que na maior parte os Orcs retratados são de diferentes tribos; por exemplo (de O Uruk-Hai ):
To Pippin's surprise he found that much of the talk was intelligible; many of the Orcs were using ordinary language. Apparently the members of two or three quite different tribes were present, and they could not understand one another's orc-speech.
É correto, portanto, que eles usem o discurso comum quando lidam uns com os outros.
Nos filmes de Hobbit, a maioria dos orcs retratados é de Dol Guldur, e também é consistente que eles usem a mesma linguagem.Em relação à Língua Negra, essa é uma linguagem separada para os dialetos órquicos e tem uma origem diferente. Mais uma vez nos referimos ao Apêndice F:
Pode-se dizer, portanto, que as línguas órquicas tiveram alguma influência da Língua Negra, mas podemos afirmar com segurança que os Orcs (em geral) não falam a Língua Negra, e a Língua Negra não é Orkish .It is said that the Black Speech was devised by Sauron in the Dark Years, and that he desired to make it the language of all those that served him, but he failed in that purpose. From the Black Speech, however, were derived many of the words that were in the Third Age wide-spread among the Orcs, such as ghâsh 'fire', but after the first overthrow of Sauron this language in its ancient form was forgotten by all but the Nazgûl. When Sauron arose again, it became once more the language of Barad-dûr and of the captains of Mordor.