The word antipyresis 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™ Play In The Letters antipyresis
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Seven Letter Word Alert: (74 words)
airiest, antsier, aptness, aspires, aspirin, entraps, inertia, inserts, inspire, instars, insteps, irisate, nastier, painter, pansies, panters, panties, parents, paresis, parties, pasters, pastier, pasties, patines, persist, pertain, pessary, pianist, piarist, pirates, pissier, pitiers, praises, pretans, priests, pterins, pyrites, raisins, rapists, repaint, repasts, resnaps, respans, respins, restain, retains, retinas, satires, seitans, sestina, sinters, snipers, sparest, spinets, spinier, spireas, spirits, sprains, spriest, sprints, sprites, spryest, stainer, stayers, strains, stripes, stripey, synapse, tiepins, tipsier, traipse, trepans, triynes, trypsin