colobus monkey vs colobus

colobus monkey and colobus both are nouns.

Word	Noun	Adjective	Verb	Adverb
colobus monkey	Yes	No	No	No
colobus	Yes	No	No	No

As nouns, colobus monkey and colobus are synonyms defined as:

colobus monkey and colobus: arboreal monkey of western and central Africa with long silky fur and reduced thumbs

colobus monkey (noun)	colobus (noun)
arboreal monkey of western and central Africa with long silky fur and reduced thumbs	arboreal monkey of western and central Africa with long silky fur and reduced thumbs