12 letters · 17 points in Scrabble
noun someone devoted to the promotion of human welfare and to social reforms
noun an advocate of the principles of humanism; someone concerned with the interests and welfare of humans
adjective marked by humanistic values and devotion to human welfare
originFrom humanity + -arian (suffix indicating an advocate of or believer in something), possibly modelled after Unitarian (“Christian who does not believe in the doctrine of the Trinity; pertaining to Unitarianism”) (see noun sense 2 and verb sense 2).
Etymology from Wiktionary, CC BY-SA 3.0