mammalian vs amnion

mammalian and amnion both are nouns.

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

mammalian (noun)	amnion (noun)
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	thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

mammalian (adjective)	amnion (adjective)
of or relating to the class Mammalia