vervet monkey vs guenon

vervet monkey and guenon both are nouns.

Word	Noun	Adjective	Verb	Adverb
vervet monkey	Yes	No	No	No
guenon	Yes	No	No	No

As nouns, guenon is a hypernym of vervet monkey; that is, guenon is a word with a broader meaning than vervet monkey:

vervet monkey: South African monkey with black face and hands
guenon: small slender African monkey having long hind limbs and tail and long hair around the face

Other hypernyms of vervet monkey include guenon monkey.

vervet monkey (noun)	guenon (noun)
South African monkey with black face and hands	small slender African monkey having long hind limbs and tail and long hair around the face