Noun
One who, or that which, improves.
Source: Webster's dictionaryThe improver of natural knowledge absolutely refuses to acknowledge authority, as such. For him, skepticism is the highest of duties; blind faith the one unpardonable sin. Thomas Henry Huxley
It seldom happens, however, that a great proprietor is a great improver. Adam Smith
Among the roles the Budget Bureau (now OMB) was that of constant critic and improver of administration in the federal executive branch. In my day this work had fallen to the products of graduate schools in civil administration. Their ideas...seemed to me theoretical nonsense. Dean Acheson
Such terms as tycoon, media baron, captain of industry, industrial magnate, financial speculator, or boss were dropped in favour of entrepreneur, now seen as the benign improver of society and the kind of person we could all aspire to being. Marnie Holborow
the addition of a bathroom was a major improvement Source: Internet
the addition of cinnamon improved the flavor Source: Internet