beast (Noun) — A living organism characterized by voluntary movement.
beast (Noun) — A cruelly rapacious person.
beast (Noun) — Something large and impressive, esp. when difficult or unpleasant to manage.
beast (Noun) — Any non-human animal, esp. a land-living mammal.
beast (Noun) — A particular kind of person or thing. ex. "he's a strange beast"