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From letters G, E, L, A, T, I, N, I, Z, A, T, I, O, N, S  I made following words

15 letter words

gelatinizations[24]

14 letter words

gelatinization[23]

13 letter words

signalization[22], latinizations[21], nationalities[13]

12 letter words

nationalizes[20], salinization[20], latinization[20], sanitization[20]

11 letter words

gleizations[20], antagonizes[20], tantalizing[20], nationalize[19], italianizes[19], tantalising[12], gestational[12], litigations[12], instigation[12], alienations[11], nationalise[11], atonalities[11], nationalist[11]

10 letter words

nasalizing[19], salinizing[19], analogizes[19], latinizing[19], gleization[19], antagonize[19], sanitizing[19], tetanizing[19], totalizing[19], italianize[18], tantalizes[18], tanzanites[18], alienating[11], negational[11], toenailing[11], galantines[11], antilogies[11], isoantigen[11], insolating[11], tangential[11], etiolating[11], litigation[11], sanitating[11], tetanising[11], agitations[11], totalising[11], antagonist[11], stagnation[11], negotiants[11], stationing[11], alienation[10], italianise[10], lineations[10], natalities[10], latinities[10], intestinal[10], tonalities[10], sanitation[10]

9 letter words

analogize[18], lionizing[18], signalize[18], sloganize[18], azotising[18], glitziest[18], latinizes[17], tantalize[17], tanzanite[17], totalizes[17], analogies[10], lesioning[10], lionising[10], genitalia[10], galantine[10], entailing[10], entoiling[10], agilities[10], alginates[10], gainliest[10], gantlines[10], enlisting[10], listening[10], tinseling[10], analogist[10], nostalgia[10], gelations[10], legations[10], intaglios[10], isolating[10], ligations[10], agnations[10], negations[10], ingestion[10], ignitions[10], singleton[10], attaining[10], tangental[10], entitling[10], inletting[10], intitling[10], agitation[10], toileting[10], negotiant[10], tailgates[10], litigates[10], satiating[10], instigate[10], tangliest[10], litigants[10], glintiest[10], tingliest[10], instating[10], insetting[10], gestation[10], antialien[9], lineation[9], analities[9], anilities[9], inanities[9], antinoise[9], nanotesla[9], nationals[9], santolina[9], tensional[9], lenitions[9], insatiate[9], initiates[9], tantalise[9], satiation[9], atonalist[9], saltation[9], stational[9], siltation[9], annotates[9], natations[9], intonates[9]

8 letter words

aliening[9], eloining[9], aliasing[9], liaising[9], insignia[9], eanlings[9], leanings[9], snailing[9], enisling[9], ensiling[9], gasoline[9], anginose[9], ionising[9], loanings[9], agential[9], alginate[9], gantline[9], latening[9], leniting[9], gelation[9], legation[9], intaglio[9], ligation[9], agnation[9], negation[9], ignition[9], ignatias[9], gelatins[9], genitals[9], stealing[9], taglines[9], tailings[9], lignites[9], lingiest[9], tannages[9], antigens[9], gentians[9], sainting[9], staining[9], ginniest[9], slanting[9], nestling[9], otalgias[9], latigoes[9], otalgies[9], tangelos[9], antilogs[9], solating[9], negatons[9], alanines[8], anilines[8], solanine[8], neonatal[8], national[8], lenition[8], alienist[8], litanies[8], initials[8], annalist[8], alations[8], elations[8], insolate[8], toenails[8]