Gazelle: a small antelope
Gemsbok/gemsbuck: a large antelope
Gerenuk: a long-necked antelope
Gnu: a large antelope
Goa: an Asian gazelle
Do not confuse antelope with gantlope, however. Gantlope was a military punishment in which the culprit had to run stripped to the waist between two rows of men who struck at him with a stick or a knotted cord. (Also known as the gauntlet.)
There were a few words pertaining to the face that I thought were particularly descriptive:
Gnathion: the tip of the chin
Gonion: a part of the lower jaw
Glabella: the smooth area between the eyebrows (less smooth if you've got a unibrow)
Enjoy.