http://en.wikipedia.org/wiki/Sudanese_Arabic
"The influence of Nubian languages
In northern and central parts of Sudan, Sudanese colloquial Arabic has
been influenced by the Nubian language, which in ancient times was the
dominant language in Southern Egypt and Northern Sudan. Many of the
agricultural and farming terms in Sudanese Arabic were adopted from
Nubian.
Sudanese Arabic: angareb < Nobiin: àngàréé "wooden bed"
Sudanese Arabic: kade:sa < Nobiin: kàdíís "cat".
The Arabic word for cat is qitt "
Marius