Cryptonym is a word that refers to a code, symbol, or name used for secrecy and concealment. There are several synonyms that express this meaning, such as cipher, code name, alias, pseudonym, and moniker. Cipher refers to a code used for encoding messages, while a code name is a name given to a project, mission, or operation to maintain confidentiality. An alias is a name used by a person other than their given name, whereas a pseudonym is a fictitious name chosen by an author. Moniker is a slang term used for a name or nickname, often adopted for anonymity or to avoid using the real name publicly. All these words share the notion of secrecy and disguise, and can be used interchangeably with cryptonym.