The word pigheadedness 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™ Play In The Letters pigheadedness
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Seven Letter Word Alert: (58 words)
aniseed, dandies, dashing, deadens, deadish, deashed, deashes, deeding, deepend, deepens, deepish, deepsea, degases, depends, depside, desands, deseeds, deshade, designs, despise, disease, dishpan, dispend, epigene, geishas, geneses, genesis, gnashed, gnashes, hagseed, heading, headpin, heaping, heeding, hipness, neighed, paddies, padding, pansies, passing, penises, phasing, pheesed, pheeses, pinhead, saddens, sashing, seaside, seeding, seepage, seeping, shading, shaping, shinpad, signees, spading, speeded, sphenes