The word pentylenetetrazol cannot be made in Words With Friends™. It is 17 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (77 words)
alertly, annoyer, aplenty, attelet, enolate, entente, enteral, entrant, entreat, entropy, eternal, lantern, lottery, loyaler, neonate, neotype, nepotal, nonlate, nonlazy, nonleap, nonplay, nonreal, operant, operate, palette, pattern, payroll, peltate, penalty, pentane, pentene, pentyne, planner, planter, platter, playlet, plenary, plotter, polarly, portent, portlet, pottant, pottery, prattle, prelate, prelaty, prenote, preteen, pretzel, pronate, pronely, protean, pteryla, reallot, reannoy, repanel, replane, replant, replate, repleat, replete, retally, retotal, tannery, tartlet, tattler, ternate, terpene, tonally, tonette, totally, trapeze, treelet, treetop, trolley, zelator, zonally