anestrous vs mammalian

anestrous is not a noun while mammalian is a noun.

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

anestrous (noun)	mammalian (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

anestrous (adjective)	mammalian (adjective)
(of lower mammals) not in a state of estrus; not in heat	of or relating to the class Mammalia
of or relating to anestrus