Final answer:
The term "villain" can be synonymous with 'evil-doer,' a term that emphasizes intent to cause harm, which is core to a villain's character in novels.
Step-by-step explanation:
The word "villain" matches several options provided, but the most appropriate synonym in most contexts would be evil-doer. The other options, such as wretch, criminal, and miscreant, do carry negative connotations and can sometimes be related to the idea of a villain.
However, evil-doer directly emphasizes the intent to cause harm, which is a core characteristic of villains or antagonists in novels. We identify characters as evil or villainous based on their actions, motives, and the impact they have within the story. Such characters often embody the opposition to the protagonist's goals and present challenges that must be overcome.