The word adventitious 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: 19
Highest Scoring Words With Friends™ Play In The Letters adventitious
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Seven Letter Word Alert: (72 words)
adonise, advents, anodise, astound, attends, attuned, attunes, aunties, avidest, dentist, destain, detains, deviant, devious, dietist, distant, ditties, dittoes, divines, donates, dotiest, doviest, dunites, edition, envious, evasion, indites, inosite, instate, instead, intuits, invades, invited, invites, iodines, iodites, ionised, naivest, natives, notated, outdate, outside, sainted, sinuate, situate, snotted, snouted, stained, station, stative, statued, stinted, student, stunted, tainted, taunted, tautens, tedious, tetanus, teutons, tidiest, tiniest, toasted, tuition, unities, unsated, unsaved, uveitis, vainest, vaunted, visited, vitiate