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From letters W, E, S, T, E, R, N, I, Z, A, T, I, O, N, S  I made following words

15 letter words

westernizations[26]

14 letter words

westernization[25], westernisation[17]

13 letter words

eternizations[21]

12 letter words

eternization[20], stationeries[12]

11 letter words

zwitterions[22], intertwines[14], antistories[11], transitions[11]

10 letter words

winterizes[21], zwitterion[21], sonnetizes[18], sanitizers[18], sensitizer[18], swanneries[13], earwitness[13], wateriness[13], wintriness[13], stonewares[13], intertwine[13], winteriest[13], seriations[10], serotinies[10], ornateness[10], tensioners[10], insertions[10], itinerates[10], entertains[10], tenantries[10], itinerants[10], orientates[10], iterations[10], stentorian[10], retentions[10], nitrations[10], transition[10], tretinoins[10], intestines[10], reinstates[10], tanistries[10], transients[10], internists[10], restations[10], stationers[10], striations[10], rottenness[10], nonartists[10], strontians[10]

9 letter words

winterize[20], interzone[17], sonnetize[17], sanitizer[17], triazines[17], notarizes[17], sanitizes[17], sensitize[17], satirizes[17], ritziness[17], tetanizes[17], tristezas[17], weariness[12], stoneware[12], wantoners[12], tawniness[12], wasteries[12], wisterias[12], witnesser[12], wateriest[12], wintriest[12], toweriest[12], sweatiest[12], wittiness[12], strawiest[12], wristiest[12], anserines[9], raininess[9], sirenians[9], antinoise[9], tanneries[9], seriation[9], anointers[9], reanoints[9], tensioner[9], insertion[9], antisense[9], insensate[9], einsteins[9], sensation[9], arsenites[9], irateness[9], resinates[9], stearines[9], teariness[9], inertness[9], ostiaries[9], earstones[9], resonates[9], assertion[9], senoritas[9], serotines[9], resonants[9], itinerate[9], entertain[9], itinerant[9], orientate[9], iteration[9], retention[9], nitration[9], tretinoin[9], sententia[9], intestine[9], intonates[9], reinstate[9], enteritis[9], interties[9], retinites[9], instanter[9], intranets[9], transient[9], internist[9], restation[9], stationer[9], tenorites[9], striation[9], nonartist[9], strontian[9], satieties[9], anisettes[9], tetanises[9], tensities[9], setenants[9], nattiness[9], stannites[9], intensest[9], sentients[9], insistent[9], noisettes[9], teosintes[9], tinstones[9], sestertia[9], treatises[9], resistant[9], straitens[9], tartiness[9], insetters[9], interests[9], sternites[9], triteness[9], strontias[9], tenorists[9]

8 letter words

anserine[8], sirenian[8], raisonne[8], inosines[8], airiness[8], ensnares[8], nearness[8], rennases[8], insnares[8], reseason[8], seasoner[8], erasions[8], sensoria[8], ironness[8], inertiae[8], triennia[8], anointer[8], reanoint[8], einstein[8], nineties[8], neonates[8], enations[8], sonatine[8], arenites[8], arsenite[8], resinate[8], stearine[8], trainees[8], inertias[8], rainiest[8], niteries[8], entrains[8], trannies[8], intenser[8], internes[8], earstone[8], resonate[8], notaries[8], senorita[8], oneriest[8], serotine[8], resonant[8], enterons[8], tenoners[8], intoners[8], ternions[8], etesians[8], teniases[8], isatines[8]