The word thrombopenia 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: 24
Highest Scoring Words With Friends™ Play In The Letters thrombopenia
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Seven Letter Word Alert: (59 words)
ambient, another, barmpot, baronet, bimorph, biotope, boatmen, boomier, boomnet, brahmin, bromate, bromine, bromite, emotion, hairnet, harpoon, heparin, hipbone, hormone, ionomer, iophobe, menorah, minaret, monitor, moorhen, moorpan, moraine, morphon, naptime, niobate, operant, oration, otarine, painter, panther, pertain, phantom, phonier, pimento, pointer, portion, potherb, primate, probate, promote, pronate, protean, protein, raiment, repaint, repoint, repoman, romaine, ropeman, taproom, tearoom, thrombi, tobiano, tonearm