The word planetoids 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: 16
Highest Scoring Words With Friends™ Play In The Letters planetoids
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Seven Letter Word Alert: (75 words)
adipose, adonise, alpines, anodise, aplites, apostle, daltons, delints, denials, dentals, dentils, deposal, deposit, despoil, destain, details, detains, dilates, dipoles, donates, dopants, dopiest, elastin, elation, entails, epsilon, indoles, instead, isolate, leantos, leptons, lionets, nailset, nepotal, notepad, opaline, opiated, opiates, painted, palsied, panties, patined, patines, pedants, pentail, pilates, piloted, plaited, planets, planted, plastid, pleions, pointed, posited, sainted, salient, sandpit, sealion, slanted, snailed, soliped, spaniel, spindle, spinode, splined, spoiled, stained, stapled, stipend, tadpole, talonid, toenail, topline, topsail, topside