The word unsubstantiated 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: 23
Highest Scoring Words With Friends™ Play In The Letters unsubstantiated
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Seven Letter Word Alert: (93 words)
absents, abstain, abutted, andante, attains, attends, attests, attuned, attunes, aunties, autists, badness, bandits, battens, bedsits, bedusts, bestuds, biassed, bitsets, bunnies, busiest, butanes, butties, dataset, dentins, dentist, destain, detains, diabase, dissent, distant, dunites, dustbin, indents, instant, instate, instead, intends, intents, nudists, sainted, satiate, seitans, sestina, siennas, sinuate, situate, snidest, stained, statins, statist, statued, statues, statute, stinted, student, studies, stunned, stunted, subdues, subedit, subnets, subside, subsite, subtend, subtest, subunit, sudates, sunbeds, sundaes, sunnies, suntans, sustain, tabinet, tainted, tannest, taunted, tautens, tautest, tenants, tetanus, tissued, unabate, unbaits, unbands, unbends, unbinds, undents, undines, unsated, unseats, unstain, untuned