The word for today is…werewolf (noun):
: a person transformed into a wolf or capable of assuming a wolf’s form
Source : Merriam -Webster
Etymology : Although English sometimes makes use of other words for howling humanoid beasties, werewolf is the leader of the pack. It’s also an ancient word, tracing all the way back to the Old English werwulf, and before that to a prehistoric predecessor that also left its paw prints on German (Werwolf) and Dutch (weerwolf). Synonyms for werewolf in English include the obscure lycanthrope, which has roots in two Greek words (lykos, meaning “wolf,” and anthr?pos, meaning “human being”), and loup-garou, which comes from Old French. Whichever you use, the lycanthropic creatures these words refer to most often assume wolf form during a full moon—at least in works of fiction. There are no credible studies to date on the behavior of real-life werewolves, as scientists have yet to find the silver bullet that proves they exist.
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