moniker

A nickname is a substitute for the proper name of a familiar person, place or thing. Commonly used to express affection, it is a form of endearment and amusement. In rarer cases, it can also be used to express defamation of character, particularly by school bullies. As a concept, it is distinct from both pseudonym and stage name, and also from a title (for example, City of Fountains), although there may be overlap in these concepts. A hypocoristic is a nickname of affection between those in love or with a close emotional bond. "Moniker" is a synonym.

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