The word subtropical 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: 22
Highest Scoring Words With Friends™ Play In The Letters subtropical
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Seven Letter Word Alert: (60 words)
abortus, aboulic, apricot, bailout, bipolar, blastic, bristol, burials, caltrop, capitol, captors, caribou, clipart, coalpit, cobalts, crustal, cuatros, culprit, cupolas, curials, curtail, labours, libator, oculars, oculist, optical, orbital, oscular, outraps, outsail, outspar, parboil, patrols, plastic, polaric, portals, prosaic, publics, rituals, rosalic, scribal, scrotal, slipout, spicula, stipula, stoical, strobic, subpial, subplot, subport, subrail, tailors, topical, toprail, topsail, tribals, tropics, uprisal, upstair, utopias