10 letters · 20 points in Scrabble
adjective capable of existing or taking place or proving true; possible to do
originEtymology tree English achieve Proto-Indo-European *-tḗr Proto-Indo-European *-dʰlom Proto-Indo-European *-dʰlis Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English achievable From achieve + -able.
Etymology from Wiktionary, CC BY-SA 3.0