The word interpolate 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™ Play In The Letters interpolate
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Seven Letter Word Alert: (81 words)
aileron, arenite, elation, enolate, enteral, entitle, entreat, etaerio, eternal, inepter, iterate, latrine, lineate, nattier, nepotal, nitrate, opaline, operant, operate, otarine, painter, palette, patient, patriot, pattern, peatier, peltate, penlite, pentail, perlite, pertain, petiole, pettier, pioneer, plainer, planter, platter, plotter, pointer, politer, portent, portlet, praline, prattle, prelate, prenote, proline, pronate, protean, protein, ratline, reliant, repaint, repanel, repilot, replait, replane, replant, replate, repleat, repoint, reptile, retinal, retinol, retitle, retotal, tentier, ternate, terpine, tertial, tiptoer, toenail, topline, toprail, trainee, treetop, trenail, triaene, triplet, tripole, triptan