The word naphthoquinones 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: 35
Highest Scoring Words With Friends™ Play In The Letters naphthoquinones
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Seven Letter Word Alert: (64 words)
anoints, antique, apthous, aunties, hatpins, hatshop, heinous, histone, housane, inhouse, inquest, intones, ionones, iphones, isotope, nannies, nations, nonanes, nonsane, nonstop, nonsuit, notions, opaques, opiates, options, outspan, outspin, panties, pasquin, patines, peanuts, pennant, pension, petunia, phonies, phonons, photons, pinenut, pinnate, piquant, piquets, piteous, pontine, potions, poutine, puniest, quinoas, quinone, quonset, saponin, sequoia, sinuate, spinnet, spinout, tannins, teashop, tenpins, tension, thiones, toonies, unspent, unstain, utopian, utopias