moonlighter

/ˈmunˌlaɪtər/
noun
  1. A person who works a second job, especially at night, in addition to their main job.
    • The company hired a moonlighter to handle the overnight security shift.
    • She's a teacher by day and a moonlighter as a freelance graphic designer.
    • Many musicians are moonlighters who play gigs on weekends while working regular jobs.
Synonyms
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