The word thermoregulator 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 thermoregulator
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Seven Letter Word Alert: (72 words)
aerogel, alerter, armhole, armorer, athlete, aureole, emulate, erratum, galette, garotte, glamour, gloater, gourmet, greater, groomer, grouter, gumtree, humeral, humoral, laugher, leaguer, leather, legroom, loather, maturer, meagrer, moorage, mottler, outmate, outrage, outrate, outroar, rathole, rattler, realter, realtor, reargue, regrate, regroom, regrout, regular, relater, remoter, reroute, retotal, retreat, reutter, rootlet, rotator, rougher, tearoom, telomer, temurah, theater, theatre, theorem, thereat, thereto, thermal, toluate, tootler, torture, tougher, treater, tremolo, turtler, tutoree, tutorer, urethra, urogram, uromere, utterer