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

15 letter words

federalizations[27]

14 letter words

federalization[26], derealizations[23]

13 letter words

derealization[22]

12 letter words

rationalized[21], orientalized[21], rationalizes[20], realizations[20], orientalizes[20], rationalised[13]

11 letter words

rationalize[19], realization[19], orientalize[19], friendliest[15], federations[15], residential[12], deaerations[12], desalinator[12], delineators[12], disrelation[12], rationalise[11]

10 letter words

denazifies[22], fertilized[22], fantasized[22], finalizers[21], fertilizes[21], fantasizer[21], linearized[19], desalinize[19], idealizers[19], serialized[19], deionizers[19], sterilized[19], alizarines[18], linearizes[18], zealotries[18], friendlies[14], infielders[14], foreladies[14], farandoles[14], reinflated[14], interfiled[14], federation[14], renotified[14], defoliates[14], deflations[14], defoliants[14], fieldstone[14], federalist[14], ironfisted[14], forestland[14], interfolds[14], reinflates[13], antilifers[13], interfiles[13], renotifies[13], reflations[13], linearised[11], ideational[11], deaeration[11], delineator[11], desalinate[11], dealations[11], nodalities[11], tailenders[11], asteroidal[11], editorials[11], idolatries[11], siderolite[11], radiations[11], reeditions[11], trainloads[11], alienators[10], rationales[10], senatorial[10], neorealist[10], sinoatrial[10]

9 letter words

finalized[21], finalizer[20], idealizer[18], deionizer[18], idealizes[18], alizarine[17], linearize[17], infielder[13], farandole[13], enfilades[13], finalised[13], diolefins[13], fairleads[13], airfields[13], aforesaid[13], feodaries[13], freeloads[13], forelands[13], enfolders[13], infolders[13], fantailed[13], defoliate[13], deflation[13], defoliant[13], airlifted[13], floreated[13], refloated[13], floriated[13], introfied[13], interfold[13], sealifted[13], fidelista[13], fantasied[13], intifadas[13], deflaters[13], foredates[13], deflators[13], flaneries[12], felonries[12], interleaf[12], reinflate[12], antilifer[12], infertile[12], interfile[12], reflation[12], frailties[12], fenestral[12], inflaters[12], forestial[12], firestone[12], introfies[12], notifiers[12], flatirons[12], inflators[12], frostline[12], eledoisin[10], sideliner[10], oleanders[10], alienated[10], dealation[10], toenailed[10], tailender[10], interlaid[10], areolated[10], editorial[10], radiation[10], reedition[10], trainload[10], datelines[10], disentail[10], ideations[10], iodinates[10], endosteal[10], delations[10], insolated[10], deletions[10], dilations[10], tolidines[10], eradiates[10], dietaries[10], detailers[10], elaterids[10], trailside[10], steradian[10], detainers[10], resinated[10], desolater[10], estradiol[10], idolaters[10], steroidal[10], dolerites[10], resonated[10], ordinates[10], desertion[10], disorient[10], retinoids[10], rondelets[10], laniaries[9], linearise[9], alienator[9], rationale[9], alienates[9], analities[9], aerialist[9], realities[9], elaterins[9], entailers[9], nearliest[9], treenails[9], saintlier[9], resilient[9], aerolites[9], oralities[9], solitaire[9], aerations[9], sanitoria[9], seriation[9], antisolar[9], rationals[9], orientals[9], relations[9], serotinal[9], tensorial[9]