The word nonobservance 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: 26
Highest Scoring Words With Friends™ Play In The Letters nonobservance
:
Seven Letter Word Alert: (39 words)
absence, acerose, banners, beacons, beavers, boranes, boreens, bravoes, broncos, caboose, cannons, canoers, carbeen, carbene, carbons, careens, carvone, caverns, coarsen, convene, corneas, coronas, encores, enrobes, ensnare, nanobes, necrose, nonanes, nonenes, nonsane, obscene, observe, obverse, oversea, racoons, recanes, scanner, verbena, verbose