Code names are often used as a form of communication to keep information private and secure. However, there are many other ways to refer to this concept. An alternative term could be "aliases," which are fake names used to conceal one's true identity. Another term is "pseudonyms," which are names used by writers or performers in place of their real names. Additionally, "nicknames" can be used to refer to individuals with code names, while "handles" are commonly used in online communities. Finally, "monikers" or "tags" are popular slang terms used to refer to code names or other identifying labels. Ultimately, the term used will depend on the context and situation in which it is being used.