The word harmonically 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: 25
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (33 words)
achiral, acholia, aclinal, acronym, acyloin, alimony, allonym, anarchy, animacy, anomaly, carinal, charily, chloral, chlorin, chroman, chyloma, clarion, coalman, cornily, cranial, crayola, halcyon, harmony, laminal, laminar, lyrical, mailcar, manilla, marconi, mayoral, monarch, morally, narcoma