The word nonobligatory 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: 23
Highest Scoring Words With Friends™ Plays In The Letters nonobligatory
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Seven Letter Word Alert: (42 words)
angrily, antlion, atoning, bairnly, bargoon, bigotry, biology, blaring, boating, bologna, bolting, bonnily, booting, braying, libator, loaning, looting, nanobot, nongoal, nonliar, nonoily, nonriot, notably, obligor, oogonia, orating, oration, orbital, orology, otology, ragbolt, ranting, roaning, rooting, tabling, tabooli, tobiano, toolbag, toolbar, tooling, trilogy, yarning