Nubians as a people are an ethno linguistic group that now speak the language of the noba
However they used to speak cushitic and it even says so in their wiki page
Most nubians acknowledge this and call themselves Sudanese kushitic
Genetically nubians cluster with beja and Habeshas who are Semetic speaking agaws
Nubians are not nilotics their Sudanese cushitics along with the beja