masterpiece (EN)
noun

noun “masterpiece”

sg. masterpiece, pl. masterpieces
  1. a work that has received a lot of positive attention from critics and is seen as the best work in someone's career
    The Mona Lisa is often regarded as Leonardo da Vinci's masterpiece, captivating millions with her enigmatic smile.
  2. a creation made to show skill and earn a place as a master in a trade group
    After years of training, the young carpenter presented a beautifully carved oak chair as his masterpiece to the guild, hoping to be recognized as a master craftsman.