The word regimental 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
Seven Letter Word Alert: (74 words)
ailment, aligner, aliment, arenite, elating, elegant, emirate, enlarge, enteral, eternal, garment, gatemen, gelatin, geminal, general, genital, gentile, gentler, germane, gleaner, gmelina, granite, grantee, greaten, gremlin, ingrate, integer, latrine, learing, leering, lineage, lineate, maltier, malting, mangier, mangler, manlier, marlite, matinee, mealier, meatier, meeting, melange, melting, migrant, migrate, mileage, minaret, mineral, mingler, mintage, netmail, ragtime, raiment, ratline, reagent, realign, reaming, reeling, regimen, reimage, reliant, retinal, ringlet, tagline, tangier, teaming, tearing, teeming, tingler, trainee, treeing, trenail, triaene