vervet monkey vs guenon monkey

vervet monkey and guenon monkey both are nouns.

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

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

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

Other hypernyms of vervet monkey include guenon.

vervet monkey (noun)	guenon monkey (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