The word unnoticeable 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™ Plays In The Letters unnoticeable
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Seven Letter Word Alert: (59 words)
abluent, aboulic, acetone, aconite, aloetic, ancient, annulet, antlion, auction, bailout, binocle, bonelet, botanic, botulin, butanol, cabinet, cannoli, canteen, catenin, cauline, caution, citable, coalbin, coalite, contain, cuneate, cutline, elation, elocute, elution, ennoble, enolate, iceboat, incubee, lactone, lection, lenient, leucine, leucite, lineate, lunatic, nebulae, neonate, niobate, noncute, nonlate, notable, nucleon, outline, taboule, tenable, toenail, toluene, tunable, unblent, unclean, unction, uneaten, unilobe