platyrrhinic vs platyrrhinian

platyrrhinic is not a noun while platyrrhinian is a noun.

Word	Noun	Adjective	Verb	Adverb
platyrrhinic	No	Yes	No	No
platyrrhinian	Yes	Yes	No	No

As adjectives, platyrrhinic and platyrrhinian are synonyms defined as:

platyrrhinic and platyrrhinian: of or related to New World monkeys having nostrils far apart or to people with broad noses

Other synonyms of platyrrhinic include broadnosed, platyrhine, platyrhinian, platyrrhine.

platyrrhinic (noun)	platyrrhinian (noun)
	hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails

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