The word microbalance 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: 26
Highest Scoring Words With Friends™ Play In The Letters microbalance
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Seven Letter Word Alert: (76 words)
abalone, acclaim, acerbic, aeolian, aerobic, aileron, airable, almoner, amiable, amoebic, anaemic, balance, balmier, banaler, binocle, boracic, breccia, bromine, cacemia, calcine, caliber, calibre, caloric, calorie, cambial, cambric, caramel, carbine, carinae, carinal, carmine, ceramic, claimer, clamber, clarion, climber, cloacae, coalbin, coalier, coalman, coalmen, cocaine, coeliac, combine, comical, conceal, conical, corneal, cornice, crabman, cranial, embolic, embroil, incomer, laconic, laminae, laminar, loamier, macabre, mailcar, manacle, manlier, marconi, meconic, microbe, mineral, miracle, moraine, narcoma, nimbler, oceanic, racemic, reclaim, reclimb, romaine, romance