The word noninterchangeable cannot be made in Words With Friends™. It is 18 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Play In The Letters noninterchangeable
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Seven Letter Word Alert: (344 words)
abalone, abating, ablator, abortee, abreact, acerate, acetone, achiral, acholia, aconite, acreage, acrobat, actable, aeolian, aerobic, aerogel, agatine, aileron, airable, airboat, airhole, alanine, alethic, algebra, alicant, aligner, aloetic, alright, ancient, angelic, anginal, another, antenna, antigen, antlion, archeal, archean, arching, archlet, arenite, areolae, article, atoning, balance, banaler, banning, bargain, baronet, bathing, bearing, beating, beeline, begonia, beignet, belcher, belting, beneath, benight, benthal, benthic, benthon, biathla, bighorn, binocle, biotech, blaring, blather, bleater, blether, blither, bloater, boating, bolting, bonelet, bonnier, botanic, botcher, brachia, bracing, brangle, breathe, brioche, bronchi, brothel, cabaret, cabinet, cabling, caliber, calibre, calorie, cannier, canning, cannoli, canteen, canting, carbeen, carbene, carbine, carinae, carinal, carnage, cartage, carting, catalog, catelog, catenin, catogen, central, certain, chagrin, chainer, changer, channel, chanter, chariot, cheater, cheerio, chelate, chlorin, cholate, cholera, choline, choragi, chorale, choregi, choring, chortle, citable, cithern, clangor, clarion, cleaner, clinger, cloning, coalbag, coalbin, coalier, coaling, coalite, coaltar, coating, cognate, cohabit, coinage, congeal, conning, contain, coreign, corneal, corning, coterie, cranial, craning, crating, earache, earlobe, earning, earthen, eatable, echelon, echoing, eighter, elating, elation, elector, elegaic, elegant, elegiac, enabler, enactor, enchain, enchant, enhance, enlarge, enlight, ennoble, enolate, enteral, enteric, enthral, enticer, entrain, erotica, etaerio, etching, eternal, ethanol, etheric, ethical, gelatin, general, generic, genetic, genital, gentian, gentile, gentler, glacier, glancer, gleaner, gleeter, gloater, globate, gracile, granite, granola, grantee, greaten, hairnet, halogen, halting, haricot, healing, hearing, hearten, heating, hectare, heeling, herbage, herblet, heretic, hernial, heroine, hetaera, hobnail, hornbag, hotline, iceberg, iceboat, ignoble, ingrate, inhaler, inreach, integer, intoner, ironage, labiate, lactone, lancing, lantern, lathing, latrine, leacher, leaning, learing, leather, leching, lectern, lection, leecher, leering, legbone, leghorn, lenient, libator, lighten, lighter, lineage, lineate, loaning, loather, nanogel, nearing, neglect, neither, neonate, niobate, nitrene, nonlate, nonliar, nonreal, notable, notcher, nothing, obliger, onliner, orating, orbital, organic, otarine, ragbolt, rainhat, ranting, rathole, ratline, reagent, realign, rebatch, rebathe, rebegan, rebegin, reblent, rechain, recheat, recital, reclang, reclean, recline, reclone, reelect, reeling, reenact, regalia, regnant, rehinge, reliant, relight, renting, reteach, retinal, retinol, ribcage, ringlet, roaning, tabling, tagline, tanager, tangelo, tangier, tanning, teacher, tearing, teenage, teenier, telogen, tenable, therein, thereon, thinner, tingler, tinhorn, toenail, tonnage, trachea, tracing, trainee, tranche, treacle, treeing, trenail, triable, triaene, trilobe, trochee