The word interdenominational cannot be made in Words With Friends™. It is 19 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters interdenominational
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Seven Letter Word Alert: (274 words)
adenine, adenoma, admiral, adrenal, aeolian, aerated, aileron, ailment, airdate, airline, airmail, airtime, alamode, alanine, alarmed, alerted, aliment, almoner, altered, amender, amentia, amidone, andante, andiron, anemone, aneroid, anilide, aniline, animate, annelid, anodont, antenna, antlion, arenite, areolae, armload, attired, dealate, delator, delimit, deliria, deltate, demerit, demerol, denarii, dentate, dentine, detrain, diamine, dietine, diimine, dilater, dilator, dimeter, diorama, diorite, domatia, doorman, doormat, doormen, dormant, dottier, earldom, earmold, edition, elation, eleidin, eloined, emailed, emanate, emendal, emerald, eminent, emirate, emitted, emitter, emotion, enamine, endnote, enolate, enteral, entitle, entrain, entrant, entreat, etaerio, eternal, imidine, imitate, inditer, inertia, initial, interim, intoned, intoner, ionomer, ironman, iterate, laminae, laminar, lamnoid, lantern, latrine, leadman, learned, lemoned, lenient, lenited, leotard, limeade, limited, limiter, lineate, lineman, linemen, lintier, loamier, loonier, maleate, malodor, maltier, manatee, mandate, mandrel, mandril, manlier, mantled, marital, marlite, martial, martian, martini, matador, matinee, mealier, meander, meatier, mediate, melanin, mention, merited, metaled, mettled, midline, militar, militia, minaret, mineral, miniate, mintier, mitered, modeler, moldier, monilia, monitor, montane, moodier, moonlit, moraine, mordant, mordent, motlier, motored, mottled, mottler, nanodot, nanorod, nattier, neonate, netmail, nettled, nitrate, nitrene, nitride, nitrite, nittier, nominal, nominee, nonamer, nondate, nondiet, noniron, nonland, nonlate, nonlead, nonliar, nonmail, nonmale, nonmate, nonmeal, nonmeat, nonreal, nonriot, notated, notator, oatmeal, odorant, oldtime, omitted, omitter, onetime, onliner, oration, ordinal, otarine, otolite, ottoman, radiant, radiate, raiment, ratline, rattail, rattled, rattoon, readmit, reamend, redealt, redline, related, reliant, relined, remated, remined, remnant, remodel, renamed, reoiled, retiled, retimed, retinal, retinol, retitle, retotal, roadman, roadmen, romaine, rootlet, rotated, tainted, talonid, tearoom, teatime, telomer, tendril, tentier, termini, termite, ternate, tertial, tiaraed, timider, tinnier, tintier, toenail, tonearm, toolman, toolmen, tootled, tootler, torment, tornado, tornote, totaled, tradein, trailed, trained, trainee, treadle, treated, tremolo, trenail, triaene, trident, tritoma