There are 423 fifteen-letter words containing A, 2I, R and U, https://www.bestwordlist.com/c/a/5/15letterwordswithaiiru.htm ACQUIRABILITIES ACRIMONIOUSNESS AGRIBUSINESSMAN AGRIBUSINESSMEN AGRICULTURALIST ALTITUDINARIANS ALUMINOTHERMIES ANFRACTUOSITIES ANTIFILIBUSTERS ANTINUCLEARISTS ANTIQUARIANISMS ANTIREPUBLICANS APPENDICULARIAN APPROPINQUATING APPROPINQUATION APPROPINQUITIES ARBORICULTURIST ATRABILIOUSNESS ATTITUDINARIANS ATTRIBUTIVENESS AUDIOMETRICALLY AUDIOMETRICIANS AUTHORITATIVELY AUTOBIOGRAPHIES BIOASTRONAUTICS BUREAUCRATISING BUREAUCRATIZING CAPRIFOLIACEOUS CENSURABILITIES CENTRIFUGALISED CENTRIFUGALISES CENTRIFUGALIZED CENTRIFUGALIZES CENTRIFUGATIONS CIRCULARISATION CIRCULARIZATION CIRCUMAMBAGIOUS CIRCUMAMBIENCES CIRCUMAMBIENTLY CIRCUMFERENTIAL CIRCUMGYRATIONS CIRCUMJACENCIES CIRCUMNAVIGABLE CIRCUMNAVIGATED CIRCUMNAVIGATES CIRCUMNAVIGATOR CIRCUMNUTATIONS CIRCUMSCRIBABLE CIRCUMSTANTIALS CIRCUMSTANTIATE CIRCUMVALLATING CIRCUMVALLATION CLAUSTROPHILIAS COLOURABILITIES COLOURISTICALLY COMPUTERISATION COMPUTERIZATION CONFIGURATIONAL CONNATURALISING CONNATURALITIES CONNATURALIZING CONVULSIONARIES COUNTERCLAIMING COUNTERINVASION COUNTERIRRITANT COUNTERSTAINING CRUCIVERBALISMS CRUCIVERBALISTS DECARBURISATION DECARBURIZATION DECOLOURISATION DECOLOURIZATION DEINDUSTRIALISE DEINDUSTRIALIZE DEMISEMIQUAVERS DESPIRITUALISED DESPIRITUALISES DESPIRITUALIZED DESPIRITUALIZES DESULFURISATION DESULFURIZATION DISARTICULATING DISARTICULATION DISARTICULATORS DISATTRIBUTIONS DISCIPLINARIUMS DISCOLOURATIONS DISEQUILIBRATED DISEQUILIBRATES DISHARMONIOUSLY DISNATURALISING DISNATURALIZING DISQUISITIONARY DISREPUTABILITY DOCUMENTARISING DOCUMENTARIZING EBURNIFICATIONS EMPYREUMATISING EMPYREUMATIZING ENUMERABILITIES EQUALITARIANISM EQUIPONDERATING EQUIPROBABILITY EUDIOMETRICALLY EUTROPHICATIONS EXTRAJUDICIALLY EXTRALINGUISTIC EXTRUDABILITIES FISSIPAROUSNESS FLIRTATIOUSNESS FORMULARISATION FORMULARIZATION FRUCTIFICATIONS FUTILITARIANISM GRANULITISATION GRANULITIZATION GUTTURALISATION GUTTURALIZATION HAEMOGLOBINURIA HAEMOGLOBINURIC HEMOGLOBINURIAS HILARIOUSNESSES HONOURABILITIES HUMANITARIANISM HUMANITARIANIST HYPERFASTIDIOUS HYPERMUTABILITY HYPERURICAEMIAS HYPOPITUITARISM ICHTHYOSAURIANS IMMEASURABILITY IMMENSURABILITY IMMUNOREACTIONS IMMUNOTHERAPIES IMPERTURBATIONS INARTICULATIONS INDISTRIBUTABLE INDIVIDUALISERS INDIVIDUALIZERS INDUSTRIALISING INDUSTRIALIZING INQUISITORIALLY INSTRUMENTALISM INSTRUMENTALIST INSTRUMENTALITY INSTRUMENTATION INSUBORDINATELY INSUBORDINATION INSURRECTIONARY INTERBEHAVIOURS INTERCLAVICULAR INTERFASCICULAR INTERINDIVIDUAL INTERJACULATING INTERLACUSTRINE INTERMODULATION INTEROSCULATING INTEROSCULATION INTERPOPULATION INTERSEXUALISMS INTERTEXTUALITY INTRAFASCICULAR INTRAPOPULATION INTRAPRENEURIAL INVOLUNTARINESS INVULNERABILITY JOURNALISATIONS JOURNALIZATIONS JURISPRUDENTIAL LATITUDINARIANS MALDISTRIBUTION MANEUVERABILITY MANOEUVRABILITY MARGARITIFEROUS MEASURABILITIES MENSURABILITIES MICROPULSATIONS MICROSPORANGIUM MINIATURISATION MINIATURIZATION MINICALCULATORS MISARTICULATING MISARTICULATION MISATTRIBUTIONS MOUNTAINEERINGS MULTIARTICULATE MULTILATERALISM MULTILATERALIST MULTIPOLARITIES MULTIRACIALISMS MULTITHREADINGS MUSICOTHERAPIES NATURALISATIONS NATURALIZATIONS NEUROBIOLOGICAL NEUROFIBRILLARY NEUROPLASTICITY NEUTRALISATIONS NEUTRALIZATIONS NONDURABILITIES NONUTILITARIANS NUCLEARISATIONS NUCLEARIZATIONS NUDIBRANCHIATES OMNIFARIOUSNESS OVERAMBITIOUSLY OVERCULTIVATION OVERSTIMULATING OVERSTIMULATION OVERUTILISATION OVERUTILIZATION OVOVIVIPAROUSLY PARALINGUISTICS PARASEXUALITIES PARTICULARISERS PARTICULARISING PARTICULARISTIC PARTICULARITIES PARTICULARIZERS PARTICULARIZING PARTURIFACIENTS PASTEURISATIONS PASTEURIZATIONS PENINSULARITIES PERDURABILITIES PERMUTABILITIES PERSPICACIOUSLY PISCICULTURALLY PLATITUDINARIAN PLATITUDINISERS PLATITUDINIZERS PLURALISTICALLY POPULARISATIONS POPULARIZATIONS PREFIGURATIVELY PREJUDICIALNESS PREPUBLICATIONS PRESSURISATIONS PRESSURIZATIONS PRONUNCIATIONAL PRUDENTIALITIES PRUSSIANISATION PRUSSIANIZATION PSEUDEPIGRAPHIC PURITANICALNESS QUADRINGENARIES QUADRIPARTITION QUADRISYLLABICS QUADRIVALENCIES QUADRUPLICATING QUADRUPLICATION QUADRUPLICITIES QUARTERFINALIST QUINALBARBITONE QUINCENTENARIES QUINGENTENARIES QUINQUAGENARIAN QUODLIBETARIANS RADICULOPATHIES RADIOSTRONTIUMS REARTICULATIONS REAUTHORISATION REAUTHORIZATION RECAPITULATIONS RECONFIGURATION REDUPLICATIVELY REFUNDABILITIES REGULARISATIONS REGULARIZATIONS REHUMANIZATIONS REINDUSTRIALISE REINDUSTRIALIZE REPUBLICANISING REPUBLICANIZING REPUDIATIONISTS RESPIRITUALISED RESPIRITUALISES RESPIRITUALIZED RESPIRITUALIZES RETURNABILITIES REVISUALISATION REVISUALIZATION REVOLUTIONARIES REVOLUTIONARILY RITUALISTICALLY ROUNDABOUTILITY RUDIMENTARINESS SCRATCHBUILDING SCRIBACIOUSNESS SECULARISATIONS SECULARIZATIONS SECURITISATIONS SECURITIZATIONS SILVICULTURALLY SINGULARISATION SINGULARIZATION SOLITUDINARIANS SPIRITUALNESSES STRATICULATIONS STRUCTURALISING STRUCTURALIZING SUBCATEGORISING SUBCATEGORIZING SUBLAPSARIANISM SUBMINIATURISED SUBMINIATURISES SUBMINIATURIZED SUBMINIATURIZES SUBORGANISATION SUBORGANIZATION SUBSTITUTIONARY SUBURBANISATION SUBURBANIZATION SUBVERSIONARIES SULPHURISATIONS SULPHURIZATIONS SUPERACTIVITIES SUPERADDITIONAL SUPERFICIALISED SUPERFICIALISES SUPERFICIALIZED SUPERFICIALIZES SUPERFICIALNESS SUPERHUMANISING SUPERHUMANITIES SUPERHUMANIZING SUPERINDIVIDUAL SUPERMAJORITIES SUPERORDINATING SUPERORDINATION SUPERORGANICISM SUPERORGANICIST SUPERPARASITISM SUPERPATRIOTISM SUPERPLASTICITY SUPERSPECIALIST SURVIVABILITIES TABULARISATIONS TABULARIZATIONS THIOBARBITURATE TRANQUILISATION TRANQUILISINGLY TRANQUILIZATION TRANQUILIZINGLY TRANSEXUALITIES TRANSFIGURATION TRANSFUSIONISTS TRANSILLUMINATE TRANSLUCIDITIES TRANSMUTABILITY TRAUMATISATIONS TRAUMATIZATIONS TRIANGULARITIES TRIBUTARINESSES TRIFLUOPERAZINE TUBERCULISATION TUBERCULIZATION UBIQUITARIANISM ULTRAFASTIDIOUS ULTRAFILTRATION ULTRALIBERALISM ULTRAPRECISIONS ULTRAVIRILITIES UNANSWERABILITY UNAPPRECIATIONS UNAPPROPRIATING UNAUTHORITATIVE UNCHRISTIANISED UNCHRISTIANISES UNCHRISTIANIZED UNCHRISTIANIZES UNCHRISTIANLIKE UNDERACTIVITIES UNDERCAPITALISE UNDERCAPITALIZE UNDERDIAGNOSING UNDERESTIMATING UNDERESTIMATION UNDERINFLATIONS UNDETERMINATION UNFAMILIARITIES UNIFORMITARIANS UNILATERALITIES UNINFORMATIVELY UNIVERSALISABLE UNIVERSALIZABLE UNORIGINALITIES UNPATRIOTICALLY UNPREMEDITATION UNPROFITABILITY UNREADABILITIES UNREALISTICALLY UNRECONCILIABLE UNRELIABILITIES UNSECTARIANISMS UNSPIRITUALISED UNSPIRITUALISES UNSPIRITUALIZED UNSPIRITUALIZES UNTRADITIONALLY UNTRANSMISSIBLE UNVERIFIABILITY UNWORKABILITIES UPGRADABILITIES UTILITARIANISED UTILITARIANISES UTILITARIANISMS UTILITARIANIZED UTILITARIANIZES VALETUDINARIANS VAPOURABILITIES VASCULARISATION VASCULARIZATION VENTRILOQUIALLY VERNACULARISING VERNACULARITIES VERNACULARIZING VICARIOUSNESSES VICISSITUDINARY VIRTUALISATIONS VIRTUALIZATIONS VOYEURISTICALLY VULNERABILITIES