There are 386 fifteen-letter words containing A, I, N, T and Z, https://www.bestwordlist.com/c/a/5/15letterwordswithaintz.htm
ACCLIMATIZATION ACHROMATIZATION AEROSOLIZATIONS AGGRANDIZEMENTS
ALCOHOLIZATIONS ALKALINIZATIONS ALLEGORIZATIONS ALPHABETIZATION
ANAGRAMMATIZING ANALYZABILITIES ANESTHETIZATION ANTAGONIZATIONS
ANTISEPTICIZING APOTHEGMATIZING ARTERIALIZATION ARTIFICIALIZING
ATTITUDINIZINGS AUTOIONIZATIONS AUTOMATIZATIONS AUTOSCHEDIAZING
AXIOMATIZATIONS AZIDOTHYMIDINES BASTARDIZATIONS BIPOLARIZATIONS
BITUMINIZATIONS BOWDLERIZATIONS BUREAUCRATIZING CALENDARIZATION
CANISTERIZATION CANNIBALIZATION CAPITALIZATIONS CARAMELIZATIONS
CATEGORIZATIONS CATHETERIZATION CATHOLICIZATION CENTRALIZATIONS
CENTRIFUGALIZED CENTRIFUGALIZES CHANNELIZATIONS CHAPTALIZATIONS
CHLORITIZATIONS CINCHONIZATIONS CIRCULARIZATION CIVILIANIZATION
COENZYMATICALLY COLLATERALIZING COLONIZATIONIST COMMODITIZATION
COMMUNALIZATION COMPUTERIZATION CONCEPTUALIZERS CONCEPTUALIZING
CONCRETIZATIONS CONNATURALIZING CONTEXTUALIZING CONVENTIONALIZE
CONVEYORIZATION CORINTHIANIZING CORPORATIZATION CRIMINALIZATION
CRYSTALIZATIONS CRYSTALLIZATION DECARBONIZATION DECARBURIZATION
DECASUALIZATION DECHRISTIANIZED DECHRISTIANIZES DECIMALIZATIONS
DECOLONIZATIONS DECOLORIZATIONS DECOLOURIZATION DECOMMUNIZATION
DECONTEXTUALIZE DEFEMINIZATIONS DEGLAMORIZATION DEHUMANIZATIONS
DEHYPNOTIZATION DEINDUSTRIALIZE DELOCALIZATIONS DEMAGNETIZATION
DEMATERIALIZING DEMOBILIZATIONS DEMOCRATIZATION DEMONETIZATIONS
DEMORALIZATIONS DEMUTUALIZATION DENATIONALIZING DENAZIFICATIONS
DEPARTMENTALIZE DEPOLARIZATIONS DERIVATIZATIONS DESACRALIZATION
DESALINIZATIONS DESENSITIZATION DESEXUALIZATION DESILVERIZATION
DESTABILIZATION DESULFURIZATION DETRIBALIZATION DEVALORIZATIONS
DEVITALIZATIONS DIAGONALIZATION DICHOTOMIZATION DIGITALIZATIONS
DISNATURALIZING DISORGANIZATION DOCUMENTARIZING DOLOMITIZATIONS
ELECTROLYZATION EMPYREUMATIZING ENHYPOSTATIZING ENTHRONIZATIONS
ENVENOMIZATIONS EPIGRAMMATIZING EPITHELIALIZING EPITHELIZATIONS
ETERNALIZATIONS ETHEREALIZATION EVANGELIZATIONS EXPERIMENTALIZE
EXTEMPORIZATION EXTENSIVIZATION EXTERIORIZATION EXTERNALIZATION
FAMILIARIZATION FANATICIZATIONS FEDERALIZATIONS FICTIONIZATIONS
FORMULARIZATION FRACTIONALIZING FRACTIONIZATION FRATERNIZATIONS
GELATINIZATIONS GENERALIZATIONS GEOMETRIZATIONS GEWURZTRAMINERS
GOVERNMENTALIZE GRANGERIZATIONS GRANULITIZATION GRAPHITIZATIONS
GREISENIZATIONS GUTTURALIZATION HEPARINIZATIONS HIBERNICIZATION
HIERARCHIZATION HOMOGENIZATIONS HORIZONTALITIES HOSPITALIZATION
HYDROGENIZATION HYPNOTIZABILITY HYPOSTASIZATION HYPOSTATIZATION
ILLEGALIZATIONS IMMATERIALIZING IMMISERIZATIONS IMMOBILIZATIONS
IMMORTALIZATION INCENTIVIZATION INDIGENIZATIONS INDUSTRIALIZING
INFANTILIZATION INFORMATIZATION INITIALIZATIONS INORGANIZATIONS
INTELLECTUALIZE INTELLIGENTZIAS INTERIORIZATION INTERNALIZATION
IRRATIONALIZING ISOIMMUNIZATION JOURNALIZATIONS KERATINIZATIONS
LARYNGECTOMIZED LATERALIZATIONS LEGITIMIZATIONS LEXICALIZATIONS
LIBERALIZATIONS LITERALIZATIONS LYOPHILIZATIONS LYSOGENIZATIONS
MACADAMIZATIONS MARGINALIZATION MASCULINIZATION MATERIALIZATION
MATHEMATICIZING MATHEMATIZATION MEDICALIZATIONS MELODRAMATIZING
MEMORIALIZATION METAGRABOLIZING METAGROBOLIZING METAMICTIZATION
METAPHYSICIZING METROPOLITANIZE MILITARIZATIONS MINERALIZATIONS
MINIATURIZATION MISSIONIZATIONS MISUTILIZATIONS MISVOCALIZATION
MONGRELIZATIONS MONOPOLIZATIONS MONUMENTALIZING MUSICALIZATIONS
MYLONITIZATIONS MYTHOLOGIZATION NATIONALIZATION NATURALIZATIONS
NEUTRALIZATIONS NITROGENIZATION NOMINALIZATIONS NONHOSPITALIZED
NONPARTIZANSHIP NUCLEARIZATIONS OCCIDENTALIZING OLIGOMERIZATION
OPTIMALIZATIONS ORIENTALIZATION ORTHOGONALIZING OVERADVERTIZING
OVERCENTRALIZED OVERCENTRALIZES OVERDRAMATIZING OVERUTILIZATION
PALATALIZATIONS PARABOLIZATIONS PARAMETRIZATION PARASITIZATIONS
PARTICULARIZING PASTEURIZATIONS PATRIALIZATIONS PATRONIZINGNESS
PEDESTRIANIZING PERSONALIZATION PHONEMICIZATION PHONETICIZATION
PHOSPHATIZATION PHOTOIONIZATION PHOTOZINCOGRAPH PIEZOMAGNETISMS
PINEALECTOMIZED PINEALECTOMIZES PLASTICIZATIONS PLATITUDINIZERS
PLATITUDINIZING POLITICIZATIONS POLYMERIZATIONS POPULARIZATIONS
PRAGMATIZATIONS PRESBYTERIANIZE PRESSURIZATIONS PRIORITIZATIONS
PROJECTIZATIONS PROLETARIANIZED PROLETARIANIZES PROPYLITIZATION
PROSELYTIZATION PRUSSIANIZATION QUIZZIFICATIONS RADICALIZATIONS
RADIOSENSITIZED RADIOSENSITIZES RATIONALIZATION REACCLIMATIZING
READVERTIZEMENT REAUTHORIZATION RECANALIZATIONS RECOGNIZABILITY
RECOLONIZATIONS RECONCEPTUALIZE RECONTEXTUALIZE RECRYSTALLIZING
REGIONALIZATION REGULARIZATIONS REHOSPITALIZING REHUMANIZATIONS
REINDUSTRIALIZE RELATIVIZATIONS REMATERIALIZING REMOBILIZATIONS
REMONETIZATIONS REMORALIZATIONS RENATIONALIZING RENORMALIZATION
REORGANIZATIONS REPOLARIZATIONS REPRIVATIZATION RESENSITIZATION
RESOCIALIZATION RESTABILIZATION RESYSTEMATIZING RETHEORIZATIONS
RETRIBALIZATION REVALORIZATIONS REVICTIMIZATION REVISUALIZATION
REVITALIZATIONS ROENTGENIZATION ROMANTICIZATION RONTGENIZATIONS
SACCHARIZATIONS SACERDOTALIZING SCANDALIZATIONS SCHEMATIZATIONS
SCHILLERIZATION SCLEROTIZATIONS SECTIONIZATIONS SECULARIZATIONS
SECURITIZATIONS SENSATIONALIZED SENSATIONALIZES SENSUALIZATIONS
SENTIMENTALIZED SENTIMENTALIZES SERICITIZATIONS SHERARDIZATIONS
SINGULARIZATION SOLUBILIZATIONS SPATIALIZATIONS SPECIALIZATIONS
SPHEROIDIZATION STANDARDIZATION STIGMATIZATIONS STROBILIZATIONS
STRUCTURALIZING SUBCATEGORIZING SUBCIVILIZATION SUBMINIATURIZED
SUBMINIATURIZES SUBOPTIMIZATION SUBORGANIZATION SUBSTANTIALIZED
SUBSTANTIALIZES SUBSTANTIVIZING SUBURBANIZATION SUBVOCALIZATION
SULFAMETHAZINES SULPHURIZATIONS SUPERNATURALIZE SYMMETRIZATIONS
SYNCHRONIZATION SYNCRETIZATIONS SYNTHESIZATIONS SYNTHETIZATIONS
SYSTEMATIZATION TABULARIZATIONS TELOMERIZATIONS TESTIMONIALIZED
TESTIMONIALIZES TEXTUALIZATIONS THEATRICALIZING THEOLOGIZATIONS
THERMALIZATIONS TOTALITARIANIZE TRADITIONALIZED TRADITIONALIZES
TRANQUILIZATION TRANQUILIZINGLY TRANSISTORIZING TRANSPARENTIZED
TRANSPARENTIZES TRAUMATIZATIONS TRICHINIZATIONS TRIFLUOPERAZINE
TRIVIALIZATIONS TROPICALIZATION TUBERCULIZATION UNANAESTHETIZED
UNCATEGORIZABLE UNCHRISTIANIZED UNCHRISTIANIZES UNDERCAPITALIZE
UNPROTESTANTIZE UNSPIRITUALIZED UNSPIRITUALIZES UTILITARIANIZED
UTILITARIANIZES VASCULARIZATION VIRTUALIZATIONS VITRIOLIZATIONS
VOLATILIZATIONS WEATHERIZATIONS WESTERNIZATIONS ZINCKIFICATIONS
ZINJANTHROPUSES ZYGOBRANCHIATES