How many letters does the top answer for “a monster able to change appearance from human to wolf and back again” have?

The most common answer is lycanthrope (11 letters).

Crossword clue: a monster able to change appearance from human to wolf and back again

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

lycanthrope 11 letters wn-def

a monster able to change appearance from human to wolf and back again

werewolf 8 letters wn-def

a monster able to change appearance from human to wolf and back again