nickname

A nickname, in some circumstances also known as a sobriquet, or informally a "moniker", is an informal substitute for the proper name of a person, place, or thing. It is distinct from a pseudonym, pen name, stage name, or title, although the concepts can overlap. A nickname may be a descriptive and based on characteristics, or it be a variant form of a proper name. Nicknames may be used for convenience by shortening a name, or they may be used to express affection, playfulness, contempt, or to reflect a particular character trait.