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From letters D, I, S, I, N, F, L, A, T, I, O, N, A, R, Y  I made following words

15 letter words

disinflationary[22]

12 letter words

inflationary[18], disinflation[16]

10 letter words

fairylands[17], solidarity[14], filiations[13], inflations[13], sanitarily[13], insanitary[13], radiations[11], trainloads[11], darnations[11], sinoatrial[10]

9 letter words

fairyland[16], floridity[16], filariids[13], intifadas[13], dionysian[13], radiantly[13], dynatrons[13], filiation[12], inflation[12], flatirons[12], inflators[12], antiroyal[12], asininity[12], antinodal[10], daltonian[10], radiation[10], trainload[10], darnation[10], dilations[10], adnations[10], nidations[10], rosanilin[9], nationals[9], santolina[9], antiarins[9], sanitoria[9], antisolar[9], rationals[9]

8 letter words

solidify[15], draftily[15], finality[14], infinity[14], infantry[14], frostily[14], filariid[12], intifada[12], fondants[12], indrafts[12], nondairy[12], lanyards[12], solidary[12], daintily[12], nodality[12], intraday[12], adroitly[12], dilatory[12], idolatry[12], dynatron[12], sodality[12], solidity[12], dystonia[12], tanyards[12], tardyons[12], filarian[11], sainfoin[11], sinfonia[11], safranin[11], airfoils[11], nonfatal[11], flatiron[11], inflator[11], fantails[11], tailfans[11], finalist[11], tailfins[11], infantas[11], tinfoils[11], fontinas[11], airlifts[11], frontals[11], nasality[11], salinity[11], insanity[11], lanosity[11], sanitary[11], stannary[11], royalist[11], solitary[11], nitrosyl[11], sialidan[9], laniards[9], ordinals[9], andirons[9], norlands[9], dilation[9], adnation[9], nidation[9], nontidal[9], antidora[9], trinodal[9], tolidins[9], diastral[9], radiants[9], distrain[9], loadstar[9], dilators[9], diatrons[9], intrados[9], trolands[9], orinasal[8], national[8], antiarin[8], notarial[8], rational[8], initials[8], annalist[8], alations[8], sonatina[8], sonantal[8], antlions[8], nitinols[8], intarsia[8], tonsilar[8]

7 letter words

infolds[11], fondant[11], indraft[11], trifold[11], fantods[11], filaria[10], airfoil[10], finalis[10], finials[10], fanions[10], farinas[10], insofar[10], florins[10], fantail[10], tailfan[10], tailfin[10], infanta[10], tinfoil[10], fontina[10], airlift[10], frontal[10], infants[10], lianoid[8], laniard[8], nadiral[8], ordinal[8], andiron[8], norland[8], inlands[8], sialoid[8], ladinos[8], radials[8], radians[8], aldrins[8], randans[8], innards[8], inroads[8], ordains[8], sadiron[8], sordini[8], ladrons[8], lardons[8], tolidin[8], radiant[8], dilator[8], diatron[8], dinitro[8], troland[8], dialist[8], distain[8], daltons[8], sandlot[8], diarist[8], alanins[7], anilins[7], liaison[7], solanin[7], solaria[7], sirloin[7], initial[7], alation[7], antlion[7], nitinol[7], antiair[7], latinas[7], solatia[7], atonias[7], latinos[7], talions[7], anoints[7], nations[7], onanist[7], lariats[7], latrias[7]