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|Noun||1.||improver - someone devoted to the promotion of human welfare and to social reforms|
|2.||improver - 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"|
additive - something added to enhance food or gasoline or paint or medicine
afterthought - an addition that was not included in the original plan; "the garage was an afterthought"
attachment - a supplementary part or accessory
constituent, element, component - an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system"