The word dysenteries 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: 15
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (50 words)
deniers, densest, density, deserts, desires, dessert, destine, destiny, diester, dieters, dissent, dryness, eeriest, entered, entrees, entries, inserts, needers, needier, nesters, redeyes, redness, reedits, reested, renests, reseeds, resends, resents, resides, seeders, seedier, seitens, senders, sestine, sinters, sneered, snidest, steered, sterned, strides, styrene, syenite, teenier, tenders, tinders, tindery, tressed, trienes, triynes, yestern