Allonyms are words that refer to a person or group by a different name. Synonyms for allonyms can include words such as aliases, pen names, noms de plume, and pseudonyms. Alias typically refers to a name used to conceal one's true identity, whereas a pen name and noms de plume are more commonly used in the literary world. Pseudonyms are names used by authors, actors, or other public figures as a stage name or to protect their real identity. Other related words include nom de guerre (a war name or alias), stage name (a name used by a performer), and screen name (a name used on the internet or in social media).