The word fourteenths is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 18
Highest Scoring Words With Friends™ Play In The Letters fourteenths
:
Seven Letter Word Alert: (44 words)
enthuse, entrust, estrone, fetters, forseen, fortune, fourths, freshen, hefters, heteros, hornets, hotfeet, hunters, netters, neuters, nutters, oftener, refutes, rehones, rehouse, retunes, rosette, shorten, shouter, shunter, shutter, snotter, stouter, stunter, tenters, tenures, tethers, teutons, thereof, thereon, thereto, thrones, tonsure, touters, trustee, tufters, tutoree, unhorse, unreset