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From letters W, H, I, M, S, I, C, A, L, N, E, S, S, E, S  I made following words

15 letter words

whimsicalnesses[25]

13 letter words

whimsicalness[23]

11 letter words

washinesses[17], scalinesses[13], aimlessness[13], sliminesses[13]

10 letter words

meanwhiles[18], achinesses[15], seneschals[15], mescalines[14], calmnesses[14], misclasses[14], ashinesses[13], wilinesses[13], saliencies[12], lacinesses[12], messalines[12], liminesses[12], classiness[12], slimnesses[12]

9 letter words

whimsical[19], meanwhile[17], wheelsman[17], eschewals[17], chewiness[17], alchemies[16], ischemias[16], chiliasms[16], washiness[15], seneschal[14], shameless[14], shamisens[14], mescaline[13], seismical[13], messianic[13], classisms[13], sinewless[12], wiseasses[12], saliences[11], salicines[11], mealiness[11], messaline[11], alienisms[11], icinesses[11], scaliness[11], seaminess[11], sliminess[11], massiness[11], messiness[11], missenses[11]

8 letter words

whalemen[16], wheelman[16], eschewal[16], whimsies[16], inchmeal[15], ischemia[15], chiliasm[15], machines[15], chamises[15], chemises[15], chessman[15], chessmen[15], mensches[15], swainish[14], wishless[14], hemlines[13], encashes[13], enchases[13], achiness[13], chinless[13], shamisen[13], inmeshes[13], minishes[13], cashless[13], messiahs[13], sashimis[13], limacine[12], melanics[12], meniscal[12], lemnisci[12], laicisms[12], amnesics[12], calmness[12], classism[12], misclass[12], haleness[11], ashiness[11], hessians[11], sashless[11], eisweins[11], wineless[11], wiliness[11], wiseness[11], newsless[11], salience[10], salicine[10], alienism[10], milesian[10], laicises[10], cleanses[10], laciness[10], sanicles[10], licenses[10], silences[10], salicins[10], lameness[10], maleness[10], maneless[10], nameless[10], salesmen[10], liminess[10], scissile[10], miseases[10], siameses[10], seamless[10], missiles[10], cassenes[10], cassines[10], sameness[10], samisens[10], missense[10], slimness[10], cassises[10], missises[10], massless[10], silesias[8], easiness[8]

7 letter words

machine[14], chamise[14], chemise[14], chiasmi[14], chimlas[14], manches[14], sachems[14], samechs[14], schemas[14], schemes[14], chiasms[14], elenchi[12], hemline[12], leaches[12], helices[12], lichees[12], ischial[12], chilies[12], achenes[12], enchase[12], chaines[12], lichens[12], haemins[12], chaises[12], seiches[12], clashes[12], chisels[12], mashies[12], messiah[12], sashimi[12], melanic[11], malices[11], laicism[11], menaces[11], amnesic[11], cinemas[11], menisci[11], camises[11], seismic[11], mescals[11], heinies[10], inhales[10], leashes[10], sheilas[10], laicise[9], mealies[9], cleanse[9], enlaces[9], scalene[9], inlaces[9], sanicle[9], scaleni[9], license[9], selenic[9], silence[9], incisal[9], salicin[9], meanies[9], meinies[9], enamels[9], melenas[9], malines[9], menials[9], seminal[9], mislain[9], iceless[9], silicas[9], misease[9], siamese[9], measles[9], aimless[9], liaises[7], silesia[7]