The word patrilineal 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 patrilineal
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Seven Letter Word Alert: (30 words)
airline, apteria, inertia, lateral, latrine, lintier, literal, painter, partial, patella, patinae, patrial, pentail, pertain, pintail, plainer, planeta, plantar, planter, praline, ratline, reliant, repaint, replait, replant, retinal, tailpin, tallier, tilapia, trenail