8 letters · 15 points in Scrabble
noun someone devoted to the promotion of human welfare and to social reforms
noun a component that is added to something to improve it
originEtymology tree English improve Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English improver From improve + -er.
Etymology from Wiktionary, CC BY-SA 3.0