Which word describes someone who uses a fake name?

The correct answer is the term that refers to a name that someone adopts other than their true name, often used for concealment or privacy. This term, "alias," originates from the Latin word meaning "otherwise." It is commonly employed in legal contexts to identify individuals who may use an assumed name.

While the other terms carry related meanings, they do not specifically denote the use of a fake name. "Pseudonymous," for instance, describes someone who writes or acts under a pseudonym, which can be seen as a specific type of alias used primarily in creative professions. "Anonymous" indicates a complete lack of identity rather than the existence of an alternative name. Similarly, "temporizer" refers to someone who delays or avoids making decisions rather than a name-related concept. Thus, "alias" directly captures the essence of using a fake name, making it the most accurate choice.