platyrrhine vs Platyrrhini

platyrrhine and Platyrrhini both are nouns.

Word	Noun	Adjective	Verb	Adverb
platyrrhine	Yes	Yes	No	No
Platyrrhini	Yes	No	No	No

platyrrhine (noun)	Platyrrhini (noun)
hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails	New World monkeys: capuchin, douroucouli, howler monkey, saki, spider monkey, squirrel monkey, titi, uakari, woolly monkey, marmoset, tamarin

platyrrhine (adjective)	Platyrrhini (adjective)
of or related to New World monkeys having nostrils far apart or to people with broad noses