The word waitressing 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: 17
Highest Scoring Words With Friends™ Plays In The Letters waitressing
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Seven Letter Word Alert: (84 words)
aigrets, airiest, airings, airwise, answers, antsier, argents, arising, earwigs, erasing, gainers, gaiters, garnets, gassier, gastrin, gnawers, granite, igniter, ignites, inertia, ingests, ingrate, ingress, inserts, instars, irisate, nastier, raising, raisins, ratings, rawness, regains, resigns, restain, resting, retains, retinas, risings, sagiest, satires, searing, seating, seitans, sestina, sewings, signers, signets, singers, sinters, sringas, stagers, stagier, stainer, staring, stewing, stinger, strains, strange, strings, tangier, tawnier, tearing, teasing, tiering, tigress, tinware, triages, twanger, twiners, twinges, waiters, waiting, wanters, wariest, wasters, wasting, wearing, wingers, winiest, winters, wiriest, wirings, witness, writing