The word eyestrains 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: 13
Highest Scoring Words With Friends™ Plays In The Letters eyestrains
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Seven Letter Word Alert: (43 words)
aeriest, antsier, arenite, earnest, easiest, eastern, ensears, entries, essayer, inserts, instars, nastier, nearest, nesters, renests, reseats, resents, restain, retains, retinas, sateens, satires, seaters, seitans, seitens, senates, sensate, seriate, sestina, sestine, sinters, stainer, stayers, sterane, strains, styrene, syenite, teasers, trainee, triaene, trienes, triynes, yestern