The word customarily 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: 21
Highest Scoring Words With Friends™ Plays In The Letters customarily
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Seven Letter Word Alert: (50 words)
atomics, atriums, citrusy, clamors, clamour, clarity, cotylar, courtly, crustal, crystal, cuatros, cultism, curials, curtail, cystoma, cytomas, layouts, mistral, moistly, mortals, morulas, mousily, mucosal, musical, mustily, myotics, oculars, oculist, oscular, outlays, outsail, raucity, rituals, rosalic, rustily, saucily, scarily, scrotal, scrotum, smartly, somatic, stoical, stromal, tailors, tourism, trisomy, trysail, turmoil, tyromas, urocyst