mammalian vs anestrous

mammalian is a noun but anestrous is not a noun.

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

mammalian (noun)	anestrous (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

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