lechwe vs waterbuck

lechwe and waterbuck both are nouns.

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

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

lechwe: tawny-colored African antelope inhabiting wet grassy plains; a threatened species
waterbuck: any of several large African antelopes of the genus Kobus having curved ridged horns and frequenting e.g. swamps and rivers

lechwe (noun)	waterbuck (noun)
tawny-colored African antelope inhabiting wet grassy plains; a threatened species	any of several large African antelopes of the genus Kobus having curved ridged horns and frequenting e.g. swamps and rivers