improver

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• February 6. 2014 from wordnet.princeton.edu

  improver — noun — english

  someone devoted to the promotion of human welfare and to social reforms

• February 28. 2016 from wordnet.princeton.edu

  improver — noun — english

  a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinnamon improved the flavor"