The word potentillas 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™ Plays In The Letters potentillas
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Seven Letter Word Alert: (52 words)
alpines, altoist, aplites, apostle, elastin, elation, entails, epsilon, install, instate, isolate, latents, latites, leantos, lentils, leptons, lintels, lionets, nailset, nepotal, opaline, opiates, pallets, panties, patents, patient, patines, patties, pentail, pilates, planets, pleions, pollens, potties, pottles, salient, sealion, spaniel, spittle, spotlit, station, stollen, talents, tallest, tallies, teapots, tinpots, tiptoes, toenail, toilets, topline, topsail