The word hypothyroidisms 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: 30
Highest Scoring Words With Friends™ Play In The Letters hypothyroidisms
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Seven Letter Word Alert: (35 words)
dimorph, diprism, disroot, history, hotrods, hydrops, imports, iodisms, isopods, isotypy, misship, missort, mitosis, moorish, opioids, pisoids, porosis, primost, prosody, rhymist, rhythms, shrimps, shrimpy, smooths, smoothy, spirits, spiroid, thyroid, toprims, toroids, torpids, toyshop, tripods, trisomy, typhoid