The word arterioles 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: 11
Highest Scoring Words With Friends™ Plays In The Letters arterioles
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Seven Letter Word Alert: (50 words)
aeriest, alerter, areoles, artsier, earlier, elaters, erotise, estriol, etaerio, isolate, loiters, lorries, oleates, realers, realest, realise, realist, realter, realtor, rearise, rearose, relater, relates, reliers, reroast, restore, retails, retears, retiles, retires, retrial, retries, rioters, roaster, roister, roseate, roselet, rostral, saltier, seriate, serrate, slatier, stealer, sterile, tailors, tarries, tearers, tearier, toilers, trailer