The word antiprotozoals 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: 28
Highest Scoring Words With Friends™ Plays In The Letters antiprotozoals
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Seven Letter Word Alert: (60 words)
altoist, artisan, atonias, atropia, attains, intorts, lariats, lotions, nostril, notator, ooplast, options, oration, parasol, partial, patinas, patrial, patriot, patrols, patrons, plantar, platoon, plosion, polaron, portals, portion, potions, protist, protons, rations, rattail, rattons, rattoon, risotto, saltpan, soprano, spartan, spatial, sporont, spotlit, starlit, station, straint, tailors, taproot, tarpans, tartans, tartpan, tinpots, toprail, topsail, topsoil, torsion, transit, triptan, tropist, tsarina, tzarina, tzarist, zoarial