The word diffractions 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: 23
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (46 words)
actions, affords, affront, astroid, atonics, candors, cantors, carotid, cartons, castoff, cations, citrons, coffins, confits, conidia, corands, cratons, crinoid, diarist, diction, discant, donairs, drastic, faction, factors, fiction, forints, frantic, iconist, incisor, indicts, indraft, infarct, inroads, insofar, nicosia, nordics, ordains, rations, saffron, satiric, soricid, tariffs, traffic, triadic, trifids