The word matricides 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: 17
Highest Scoring Words With Friends™ Play In The Letters matricides
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Seven Letter Word Alert: (46 words)
admires, airiest, airside, airtime, aridest, astride, credits, cristae, dacites, dairies, deistic, diaries, diarist, diciest, dietics, dimeric, directs, dirties, disrate, ditsier, drastic, icedams, irisate, metrics, midairs, miscite, misdate, misedit, misread, mistier, raciest, radices, readmit, redacts, satiric, sidearm, sidecar, siriema, smarted, smartie, stimied, tidiers, timider, tirades, triadic, tridems