The word assertively 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (83 words)
aeriest, airless, artless, earless, easiest, elaters, elative, essayer, estival, evilest, eyeslit, irately, laveers, leasers, leavers, lyrists, lysates, rayless, realest, realise, realist, reality, relates, relists, relives, resails, resales, resaves, reseals, reseats, restive, restyle, retails, retiles, reveals, reviles, revises, sailers, saltier, salvers, satires, sealers, seaters, serials, seriate, servals, servile, servlet, several, sievert, silvers, silvery, slaters, slatier, slavers, slavery, slayers, sleaves, slivers, starves, stayers, stealer, sterile, stivers, strives, stylers, stylier, stylise, svelter, sylvite, tealess, tearily, teasels, teasers, tersely, tieless, travels, trysail, variety, varsity, veilers, verists, veritas