The word nonobservant 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: 22
Highest Scoring Words With Friends™ Play In The Letters nonobservant
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Seven Letter Word Alert: (31 words)
atoners, banners, banters, baronet, boaster, boaters, bonnets, booster, booters, boranes, borates, bravest, bravoes, nanobes, nanobot, nonanes, nonarts, nonsane, obovate, obverts, oversat, reboast, reboost, reboots, seaboot, senator, servant, sorbate, tanners, taverns, treason