The word appetisers 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: 16
Highest Scoring Words With Friends™ Plays In The Letters appetisers
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Seven Letter Word Alert: (46 words)
aeriest, apprise, asperse, aspires, easiest, paresis, parties, pasters, pastier, pasties, peatier, peptise, persist, pesters, pirates, praises, presets, pretape, priests, rapists, repaste, repasts, repeats, repipes, reseats, respite, resteps, retapes, sappers, sappier, satires, seaters, serapes, seriate, sippers, sparest, spireas, spriest, sprites, stepper, steppes, stripes, tappers, teasers, tippers, traipse