The word trigeminal 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 trigeminal
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Seven Letter Word Alert: (62 words)
ailment, airline, airtime, aligner, aliment, elating, garment, gelatin, geminal, genital, gmelina, granite, gremlin, igniter, imagine, inertia, ingrate, intagli, interim, lairing, latrine, learing, lignite, limiter, lintier, mailing, maltier, malting, mangier, mangler, manlier, marlite, martini, melting, migrant, migrate, militar, minaret, mineral, mingler, miniate, mintage, mintier, netmail, ragtime, railing, raiment, ratline, realign, reaming, reliant, retinal, ringlet, tagline, tailing, tangier, teaming, tearing, termini, tiering, tingler, trenail