kob vs waterbuck

kob and waterbuck both are nouns.

Word	Noun	Adjective	Verb	Adverb
kob	Yes	No	No	No
waterbuck	Yes	No	No	No

As nouns, waterbuck is a hypernym of kob; that is, waterbuck is a word with a broader meaning than kob:

kob: an orange-brown antelope of southeast Africa
waterbuck: any of several large African antelopes of the genus Kobus having curved ridged horns and frequenting e.g. swamps and rivers

kob (noun)	waterbuck (noun)
an orange-brown antelope of southeast Africa	any of several large African antelopes of the genus Kobus having curved ridged horns and frequenting e.g. swamps and rivers