plantigrade vs mammalian

plantigrade and mammalian both are nouns.

Word	Noun	Adjective	Verb	Adverb
plantigrade	Yes	Yes	No	No
mammalian	Yes	Yes	No	No

plantigrade (noun)	mammalian (noun)
an animal that walks with the entire sole of the foot touching the ground as e.g. bears and human beings	any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk

plantigrade (adjective)	mammalian (adjective)
(of mammals) walking on the whole sole of the foot (as rabbits, raccoons, bears, and humans do)	of or relating to the class Mammalia