hartebeest
springbok
Ibex
Oryx.
eland
oribi
Harvey's duiker
kudu
Dorcan Gazelle
Yellow-backed Duiker is an antelope species in Africa.
suni
There isn't one (unless you were thinking of the gnu), but the nilgai is a large Indian antelope.
Nyala is a large African antelope that begins with an 'N.'