The word patrilinear 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (37 words)
airline, apteria, inertia, latrine, lintier, narrate, painter, partial, partner, patinae, patrial, pentail, pertain, pintail, plainer, planeta, plantar, planter, prairie, praline, printer, rainier, ratline, reliant, repaint, replait, replant, reprint, retinal, retrain, retrial, tailpin, terrain, tilapia, trailer, trainer, trenail