spider monkey vs platyrrhinian

spider monkey and platyrrhinian both are nouns.

Word	Noun	Adjective	Verb	Adverb
spider monkey	Yes	No	No	No
platyrrhinian	Yes	Yes	No	No

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

spider monkey: arboreal monkey of tropical America with long slender legs and long prehensile tail
platyrrhinian: hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails

Other hypernyms of spider monkey include New World monkey, platyrrhine.

spider monkey (noun)	platyrrhinian (noun)
arboreal monkey of tropical America with long slender legs and long prehensile tail	hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails

spider monkey (adjective)	platyrrhinian (adjective)
	of or related to New World monkeys having nostrils far apart or to people with broad noses