sobriquet

/ˈsoʊbrɪkeɪ/
noun
  1. A nickname or informal name given to a person, place, or thing.
    • His teammates gave him the sobriquet 'Flash' because of his speed.
    • The singer was known by the sobriquet 'The King of Pop.'
    • The city earned the sobriquet 'The Big Apple' in the 1920s.
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