The word portliest 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: 13
Highest Scoring Words With Friends™ Play In The Letters portliest
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Seven Letter Word Alert: (33 words)
estriol, litters, loiters, petrols, plotter, politer, portlet, potters, potties, pottles, protest, protist, repilot, replots, resplit, retilts, ropiest, slitter, spittle, spoiler, spotlit, spotter, stilter, tilters, tipster, tiptoer, tiptoes, toilers, toilets, triples, triplet, tripole, tropist