improver

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. 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
• Syn:
addition, add-on
• Derivationally related forms:
improve, add on (for: add-on), add (for: addition)
• Hypernyms:
component, constituent, element
• Hyponyms:
additive, afterthought, annex, annexe, extension,
wing, attachment, elongation
2. someone devoted to the promotion of human welfare and to social reforms
• Syn:
humanitarian, do-gooder
• Derivationally related forms:
improve, do good (for: do-gooder)
• Hypernyms:
benefactor, helper

• Từ đồng nghĩa / Synonyms:
  addition, add-on, humanitarian, do-gooder