The word convertibilities cannot be made in Words With Friends™. It is 16 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters convertibilities
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Seven Letter Word Alert: (242 words)
betitle, betoils, betters, binocle, biolite, biotest, biotics, biotins, biotite, bitcoin, bitsier, bitters, bittier, blister, blotter, boilers, boletes, bolster, bolters, bonelet, boneset, boniest, boreens, botnets, bottler, bottles, bovines, brevets, bristle, bristol, brittle, cenotes, centers, centres, cistern, citrine, citrons, cittern, clients, clitter, cloners, clotter, clovers, coesite, coiners, colitis, colters, contest, convert, cornets, cornett, coterie, cotters, coverts, coveter, covines, creoles, cretins, cronies, ebonics, ebonies, elector, elicits, elision, elitist, enclose, encores, enrobes, enteric, enticer, entices, entitle, entries, enviers, eosinic, erosive, erotics, erotise, estriol, estrone, evictor, evilest, evinces, iconist, ileitis, incisor, inciter, incites, inosite, intorts, invects, inverse, inverts, invitee, inviter, invites, invitro, invoice, iolites, ioniser, irenics, ironies, ivories, ivorist, lectern, lection, lenites, letters, license, lintier, lionets, lionise, litters, lobster, loiters, necrose, netters, nettles, niobite, nitrite, nittier, noblest, noisier, norites, nostril, notices, novices, obscene, observe, obverse, obverts, octenes, oiliest, olivine, orients, overbit, overlie, overlit, overset, oversit, rebites, reblent, reboils, recites, recline, reclone, reclose, recoils, recoins, relents, relines, relives, reslice, resolve, restive, retiles, retilts, retinol, retints, retitle, reviles, revisit, revoice, revolts, revotes, riblets, risible, roselet, rosette, scenter, section, sericin, service, servile, servlet, setbolt, settler, sievert, silence, silicon, siltier, sincere, sirloin, slitter, snotter, solicit, solvent, sorbite, stencil, sterile, stilter, stivier, stonier, striven, strobic, svelter, teleost, telnets, tensile, tenters, tentier, testier, tilters, tiniest, tinters, tintier, titivil, toilers, toilets, trebles, trestle, tricots, trienes, trilobe, triones, trisect, trivets, vectors, veilers, veilier, veinier, veinlet, verbose, versine, version, vesicle, vetoers, vibrios, victors, vinelet, violent, violets, violins, violist, virions, visible, visitor, vitrine, vitriol, vittles, voicers, voteens