The word endonucleases 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: 21
Highest Scoring Words With Friends™ Play In The Letters endonucleases
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Seven Letter Word Alert: (61 words)
acnodes, aldoses, ascends, candles, classed, clauses, cleaned, cleanse, consuls, coulees, counsel, deacons, decanes, decease, decenes, declass, delouse, descale, elodeas, encased, encases, enclose, encodes, endless, enolase, enseals, ensouls, escudos, essence, euclase, lassoed, needles, nodules, nonlead, nonsale, noseans, nuanced, nuances, nucleon, oldness, oneness, scalene, scanned, seances, secedes, seclude, seconds, seduces, sensual, solaced, solaces, sundaes, uncased, unclads, unclean, unclose, unlaced, unlaces, unladen, unloads, unseals