The word flavorlessness 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 flavorlessness
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Seven Letter Word Alert: (58 words)
alveole, areoles, earless, enolase, enrolls, enseals, ensears, enslave, fallers, fellers, flavone, flavors, flenser, flenses, florals, flosses, forseen, lassoer, lassoes, laveers, leaners, leasers, leavens, leavers, lessens, lessons, lessors, loafers, loaners, novella, oarless, oneself, orleans, overall, oversea, reasons, reloans, resales, resaves, reseals, resells, resoles, resolve, reveals, salvers, sealers, seasons, sellers, sensors, servals, several, slavers, sleaves, slovens, solvers, sonless, veneral, vessels