The word semisynthetic 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: 24
Highest Scoring Words With Friends™ Play In The Letters semisynthetic
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Seven Letter Word Alert: (45 words)
cements, chemist, chimney, chymist, cystine, emetics, encysts, entices, ethnics, ethynes, hessite, hymnist, ichnite, iciness, incests, incises, incites, insects, itemise, itemset, menisci, miscite, mitiest, mittens, mystics, nemesis, schemes, scythes, seismic, seitens, sestine, siemens, smitten, snitchy, stenchy, stimies, stymies, syenite, techies, tensest, theisms, theists, thymine, tiniest, titmice