The word investigation 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: 21
Highest Scoring Words With Friends™ Play In The Letters investigation
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Seven Letter Word Alert: (60 words)
agonies, agonise, agonist, anoints, antigen, asinine, atoning, egotist, evasion, eviting, gavotte, gentian, geostat, ignites, inosine, inosite, instant, instate, intents, intones, invents, invites, naivest, nations, natives, nesting, netting, onstage, seating, setting, sieving, sitting, stating, station, stative, staving, stiving, stoning, tangent, tannest, tasting, teasing, tenants, tensing, tension, tenting, testing, tiniest, tinting, tonnage, vainest, vatting, veining, venison, venting, vesting, vetoing, vetting, vintage, vitiate