The word dorsiflexion 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: 25
Highest Scoring Words With Friends™ Play In The Letters dorsiflexion
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Seven Letter Word Alert: (47 words)
dioxins, doilies, elision, elixirs, enfolds, erosion, finders, flexion, flooder, floored, florins, folders, fondler, fondles, friends, idolise, indoles, indoors, indorse, infidel, infield, infolds, insider, iodines, iodiser, ionised, ioniser, ironies, lionise, loonier, loonies, noisier, noodles, oilfire, olefins, oleosin, onefold, orioles, oxidise, refinds, reflood, refolds, rosined, sexfoil, sirloin, sixfold, soldier