mammalian vs pilus

mammalian and pilus both are nouns.

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

mammalian (noun)	pilus (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	hairlike structure especially on the surface of a cell or microorganism
	any of the cylindrical filaments characteristically growing from the epidermis of a mammal

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