soubriquet
/ˈsoʊbrɪˌkeɪ/
noun
- A nickname or descriptive name, often humorous or affectionate.
- The old man was known by the soubriquet 'The Professor' because of his love for books.
- Her friends gave her the soubriquet 'Sunshine' because of her cheerful personality.
- The city earned the soubriquet 'The Big Apple' many decades ago.