8 letters · 12 points in Scrabble
noun someone who pays for goods or services
originFrom Middle English custumer, from Old French coustumier, costumier (compare modern French coutumier), from Medieval Latin custumarius (“a toll-gatherer, tax-collector”, noun), from custumarius (“pertaining to custom or customs”, adjective), from custuma (“custom, tax”). More at custom. By surface analysis, custom + -er.
Etymology from Wiktionary, CC BY-SA 3.0