Definitions from Wiktionary (improver)

▸ noun:  Something that, or someone who, improves something.
▸ noun:  (obsolete) Specifically, a person who improves land or property, a landscaper.
▸ noun:  One who improves his or her performance, one who shows improvement (of individuals or groups).
▸ noun:  A substance added to cause improvement (especially to a foodstuff).
▸ noun:  (historical) A pad worn by women to make the dress hang properly.
▸ noun:  One who performs improv; an improviser.

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