achiever - definition and synonyms

noun [countable] 

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/əˈtʃiːvə(r)/
singularachiever
pluralachievers
  1. someone who is successful because they are determined and work hard
    high/low achiever (=someone who is extremely successful/not very successful in life):

    Bob’s not what you would call one of life’s high achievers.

    See also underachiever