The word intrusiveness 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: 20
Highest Scoring Words With Friends™ Play In The Letters intrusiveness
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Seven Letter Word Alert: (77 words)
ensuite, ensures, entries, enviers, inserts, insists, insures, intense, interns, inturns, invents, inverse, inverts, invests, invitee, inviter, invites, issuers, nesters, neuters, nitrene, nutsier, reissue, renests, rennets, resents, resists, restive, retunes, reunite, revises, revisit, revuist, russets, seitens, sestine, sievert, sinners, sinters, sinuses, sissier, sisters, stivers, stivier, striven, strives, stunner, suiters, sunnier, sunnies, sunrise, sunsets, tenners, tenures, tinners, tinnier, tissues, tresses, trienes, trusses, uniters, unities, unnerve, unreset, unrests, unrisen, unrivet, uterine, uveitis, veinier, venture, verists, versine, vintner, virtues, viruses, vitrine