Old World monkey vs catarrhine

Old World monkey and catarrhine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old World monkey	Yes	No	No	No
catarrhine	Yes	Yes	No	No

As nouns, Old World monkey and catarrhine are synonyms defined as:

Old World monkey and catarrhine: of Africa or Arabia or Asia; having nonprehensile tails and nostrils close together

Old World monkey (noun)	catarrhine (noun)
of Africa or Arabia or Asia; having nonprehensile tails and nostrils close together	of Africa or Arabia or Asia; having nonprehensile tails and nostrils close together

Old World monkey (adjective)	catarrhine (adjective)
	of or related to Old World monkeys that have nostrils together and opening downward