The word deoxyriboses 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: 25
Highest Scoring Words With Friends™ Play In The Letters deoxyriboses
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Seven Letter Word Alert: (24 words)
bedress, bedsore, besides, bossier, boysier, byssoid, derbies, desires, disobey, disrobe, dossier, obeyers, orebody, oxbirds, reboxed, reboxes, resides, ribeyes, riboses, seedbox, sobered, soirees, xeroses, xerosis