The word unguaranteed 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: 19
Highest Scoring Words With Friends™ Plays In The Letters unguaranteed
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Seven Letter Word Alert: (33 words)
aerated, andante, angered, augured, denture, derange, detuner, dragnet, enraged, gaunted, gaunter, gradate, granted, grantee, greaten, grenade, grunted, natured, negated, reagent, regnant, retuned, tanager, tenured, trudgen, turndun, uneager, unearnt, uneaten, unguent, unrated, untread, untuned