There are 561 fifteen-letter words containing A, G, I, N and R, https://www.bestwordlist.com/c/a/5/15letterwordswithaginr.htm
ABORIGINALITIES AGGRANDISEMENTS AGGRANDIZEMENTS AGRANULOCYTOSIS
AGRIBUSINESSMAN AGRIBUSINESSMEN ALLEGORICALNESS ALLEGORISATIONS
ALLEGORIZATIONS ALLERGENICITIES ANAGRAMMATISING ANAGRAMMATIZING
ANGUSTIROSTRATE ANTHROPOBIOLOGY ANTHROPOGENESIS ANTHROPOGENETIC
ANTHROPOLOGICAL ANTHROPOLOGISTS ANTHROPOPHAGIES ANTHROPOPHAGITE
ANTICARCINOGENS ANTICHOLINERGIC ANTIEGALITARIAN ANTIFERROMAGNET
ANTILOGARITHMIC ANTIOESTROGENIC ANTIPORNOGRAPHY ANTIPROGRESSIVE
ANTISEGREGATION APPROPINQUATING APPROXIMEETINGS ARCHEOMAGNETISM
ARCHGENETHLIACS ARGUMENTATIVELY ARTIFICIALISING ARTIFICIALIZING
ASTRONAVIGATION ASTRONAVIGATORS AUTODESTRUCTING BACKSCATTERINGS
BACKSCRATCHINGS BIODEGRADATIONS BIOREGIONALISMS BIOREGIONALISTS
BRACHYDIAGONALS BRAUNSCHWEIGERS BRONCHOGRAPHIES BUREAUCRATISING
BUREAUCRATIZING CARCINOGENICITY CATEGORICALNESS CATEGORISATIONS
CATEGORIZATIONS CENTRIFUGALISED CENTRIFUGALISES CENTRIFUGALIZED
CENTRIFUGALIZES CENTRIFUGATIONS CHOLANGIOGRAPHY CHOLINERGICALLY
CHRONOGRAMMATIC CHRONOLOGICALLY CINEANGIOGRAPHY CINEMATOGRAPHED
CINEMATOGRAPHER CINEMATOGRAPHIC CINEMICROGRAPHY CIRCUMGYRATIONS
CIRCUMNAVIGABLE CIRCUMNAVIGATED CIRCUMNAVIGATES CIRCUMNAVIGATOR
CIRCUMVALLATING COADMINISTERING COINVESTIGATORS COLLATERALISING
COLLATERALIZING COMMERCIALISING COMMERCIALIZING COMMISERATINGLY
CONFIGURATIONAL CONGLOMERATIONS CONGRATULATIONS CONGRESSIONALLY
CONNATURALISING CONNATURALIZING CORINTHIANISING CORINTHIANIZING
COUNTERCAMPAIGN COUNTERCHANGING COUNTERCHARGING COUNTERCHARMING
COUNTERCLAIMING COUNTERGUERILLA COUNTERMARCHING COUNTERPLANNING
COUNTERPLEADING COUNTERRALLYING COUNTERSHADINGS COUNTERSTAINING
CRANIOLOGICALLY CREDENTIALLINGS CROSSOPTERYGIAN CYBERSQUATTINGS
DAGUERREOTYPING DECARBOXYLATING DECONCENTRATING DECRIMINALISING
DECRIMINALIZING DEFAMILIARIZING DEFRAGMENTATION DEGENERATIONIST
DEGLAMORISATION DEGLAMORIZATION DEGRADINGNESSES DEHYDROGENATING
DEHYDROGENATION DEMATERIALISING DEMATERIALIZING DEPERSONALISING
DEPERSONALIZING DEREGISTRATIONS DIFFERENTIATING DIFFRANGIBILITY
DISAGGREGATIONS DISARRANGEMENTS DISARTICULATING DISCOURAGEMENTS
DISEMBARRASSING DISGRACEFULNESS DISHEARTENINGLY DISINTEGRATIONS
DISINTHRALLINGS DISINVIGORATING DISNATURALISING DISNATURALIZING
DISORGANISATION DISORGANIZATION DOCUMENTARISING DOCUMENTARIZING
DOWNREGULATIONS DRAUGHTPROOFING DRAUGHTSMANSHIP EARTHSHATTERING
EGALITARIANISMS ELECTROMAGNETIC ELECTRONEGATIVE ELECTROPLATINGS
EMBRACINGNESSES EMPYREUMATISING EMPYREUMATIZING ENDEARINGNESSES
ENGRAINEDNESSES EPEIROGENICALLY EPIGRAMMATISING EPIGRAMMATIZING
EQUIPONDERATING EVANGELISTARIES EVANGELISTARION EVERLASTINGNESS
EXTRALINGUISTIC FARTHINGSWORTHS FEATHERBEDDINGS FERRIMAGNETISMS
FERROMAGNETISMS FRACTIONALISING FRACTIONALIZING FRAGMENTARINESS
FRANGIBLENESSES GALVANOMETRICAL GALVANOTROPISMS GASTROENTERITIC
GASTROENTERITIS GASTRONOMICALLY GENERALISATIONS GENERALIZATIONS
GENTLEWOMANLIER GENTRIFICATIONS GEOMETRISATIONS GEOMETRIZATIONS
GERMINABILITIES GERRYMANDERINGS GEWURZTRAMINERS GINGERBREADIEST
GONIOMETRICALLY GOVERNABILITIES GOVERNMENTALISE GOVERNMENTALISM
GOVERNMENTALIST GOVERNMENTALIZE GRAMMATICALNESS GRAMOPHONICALLY
GRANDFATHERLIER GRANDILOQUENCES GRANDILOQUENTLY GRANDIOSENESSES
GRANDMOTHERLIER GRANGERISATIONS GRANGERIZATIONS GRANITIFICATION
GRANULITISATION GRANULITIZATION GRAPHICALNESSES GRAPHITISATIONS
GRAPHITIZATIONS GRAVIPERCEPTION GRAVITATIONALLY GREISENISATIONS
GREISENIZATIONS GROUNDBREAKINGS GUTTURALISATION GUTTURALIZATION
GYNANDROMORPHIC HAEMOGLOBINURIA HAEMOGLOBINURIC HEARTBREAKINGLY
HEMOGLOBINURIAS HIERACOSPHINGES HYDROGENISATION HYDROGENIZATION
HYPERPOLARISING HYPERPOLARIZING HYPERVIGILANCES IATROGENICITIES
IMAGINARINESSES IMMATERIALISING IMMATERIALIZING IMPERSONALISING
IMPERSONALIZING IMPREGNABLENESS INDUSTRIALISING INDUSTRIALIZING
INFRANGIBLENESS INGRAINEDNESSES INORGANISATIONS INORGANIZATIONS
INTEGRABILITIES INTEGRATIONISTS INTERCHANGEABLE INTERCHANGEABLY
INTERCHANGEMENT INTERCOLLEGIATE INTERDIGITATING INTERDIGITATION
INTERGENERATION INTERGRADATIONS INTERJACULATING INTERLAMINATING
INTERMIGRATIONS INTEROSCULATING INTERPERMEATING INTERPHALANGEAL
INTERROGATINGLY INTERROGATIONAL INTERROGATIVELY INTERROGATORIES
INTERROGATORILY INTERTANGLEMENT INTRANSIGEANCES INTRANSIGEANTLY
INTRANSIGENCIES INTRANSIGENTISM INTRANSIGENTIST IRRATIONALISING
IRRATIONALIZING KINDERGARTENERS KINEMATOGRAPHER KINEMATOGRAPHIC
LACTOVEGETARIAN LARYNGECTOMISED LARYNGECTOMIZED LARYNGOSCOPISTS
LEGERDEMAINISTS LYMPHANGIOGRAMS MACROMARKETINGS MACROSPORANGIUM
MAGISTERIALNESS MAGNETOELECTRIC MALACOPTERYGIAN MARCONIGRAPHING
MARGINALISATION MARGINALIZATION MEGACORPORATION MELODRAMATISING
MELODRAMATIZING METAGRABOLISING METAGRABOLIZING METAGROBOLISING
METAGROBOLIZING MICROAGGRESSION MICROGENERATION MICROMANAGEMENT
MICROMARKETINGS MICROSPORANGIUM MINERALOGICALLY MISAPPRECIATING
MISAPPREHENDING MISARRANGEMENTS MISARTICULATING MISGOVERNAUNCES
MISREGISTRATION MISTRANSCRIBING MONGRELISATIONS MONGRELIZATIONS
MONOGRAPHICALLY MOUNTAINEERINGS MOUTHWATERINGLY MULTITHREADINGS
NEARSIGHTEDNESS NEUROBIOLOGICAL NEUROMARKETINGS NEUROPATHOLOGIC
NEUROSURGICALLY NIGGARDLINESSES NIGHTMARISHNESS NITROGENISATION
NITROGENIZATION NOMOGRAPHICALLY NONAGRICULTURAL NONBIOGRAPHICAL
NONCARCINOGENIC NONPHOTOGRAPHIC NONSEGREGATIONS NORMOGLYCAEMIAS
NOTHINGARIANISM OCEANOGRAPHICAL OESTROGENICALLY OLIGODENDROGLIA
OLIGOMERISATION OLIGOMERIZATION ORGANOCHLORINES ORGANOGRAPHICAL
ORGANOGRAPHISTS ORGANOMERCURIAL ORGANOMETALLICS ORGANOTHERAPIES
ORTHOGONALISING ORTHOGONALITIES ORTHOGONALIZING OSMOREGULATIONS
OVERADVERTISING OVERADVERTIZING OVERBEARINGNESS OVERCLASSIFYING
OVERDRAMATISING OVERDRAMATIZING OVERELABORATING OVEREMPHASISING
OVEREMPHASIZING OVERENCOURAGING OVERGENERALISED OVERGENERALISES
OVERGENERALIZED OVERGENERALIZES OVERGLAMORISING OVERGLAMORIZING
OVERIMAGINATIVE OVERORNAMENTING OVERPROGRAMMING OVERREGULATIONS
OVERSPECULATING OVERSTIMULATING PAMPHLETEERINGS PANTOPRAGMATICS
PARAGENETICALLY PARALINGUISTICS PARTHENOGENESIS PARTHENOGENETIC
PARTICULARISING PARTICULARIZING PATRONIZINGNESS PEDESTRIANISING
PEDESTRIANIZING PERFECTIONATING PERINATOLOGISTS PHANTASMAGORIAL
PHANTASMAGORIAS PHANTASMAGORIES PHARMACOGENOMIC PHARMACOGNOSIES
PHARMACOGNOSIST PHARMACOGNOSTIC PHARYNGOLOGICAL PHARYNGOLOGISTS
PHARYNGOSCOPIES PHONAUTOGRAPHIC PHONOCARDIOGRAM PHONOGRAMICALLY
PHOSPHORYLATING PHOTOENGRAVINGS PHOTOZINCOGRAPH PHRASEMONGERING
PHRENOLOGICALLY POSTGRADUATIONS PRAGMATICALNESS PRAGMATISATIONS
PRAGMATIZATIONS PREDESIGNATIONS PREESTABLISHING PREKINDERGARTEN
PRENEGOTIATIONS PREPROGRAMMINGS PREREGISTRATION PROCRASTINATING
PROGNOSTICATING PROGNOSTICATION PROGNOSTICATIVE PROGNOSTICATORS
PROGRESSIONALLY PRONOMINALISING PRONOMINALIZING PROPORTIONATING
PROVERBIALISING PROVERBIALIZING PROVINCIALISING PROVINCIALIZING
PSEUDEPIGRAPHON QUADRAGENARIANS QUADRINGENARIES QUADRUPLICATING
QUARTERBACKINGS QUINGENTENARIES QUINQUAGENARIAN RADIOACTIVATING
RADIOGONIOMETER RADIOGONIOMETRY RANGATIRATANGAS REACCLIMATISING
REACCLIMATIZING READMINISTERING REAPPROPRIATING RECOGNISABILITY
RECOGNIZABILITY RECONCENTRATING RECONFIGURATION RECONSOLIDATING
RECONTAMINATING RECRYSTALLISING RECRYSTALLIZING REDINTEGRATIONS
REFRANGIBLENESS REGIONALISATION REGIONALIZATION REGULARISATIONS
REGULARIZATIONS REHOSPITALISING REHOSPITALIZING REINCORPORATING
REINTERROGATING REINTERROGATION REINVESTIGATING REINVESTIGATION
REINVIGORATIONS REMANUFACTURING REMATERIALISING REMATERIALIZING
REMONSTRATINGLY RENATIONALISING RENATIONALIZING REORCHESTRATING
REORGANISATIONS REORGANIZATIONS REPHOTOGRAPHING REPUBLICANISING
REPUBLICANIZING REREGISTRATIONS RESYSTEMATISING RESYSTEMATIZING
RETROGRADATIONS RETROGRESSIONAL REVEALINGNESSES RIGHTABLENESSES
RIGIDIFICATIONS ROENTGENISATION ROENTGENIZATION RONTGENISATIONS
RONTGENIZATIONS RONTGENOLOGICAL SACERDOTALISING SACERDOTALIZING
SAPROGENICITIES SAUROPTERYGIANS SCAREMONGERINGS SCHOOLMASTERING
SCRATCHBUILDING SCRIMSHANDERING SEARCHINGNESSES SEGREGATIONISTS
SELENOGRAPHICAL SELENOGRAPHISTS SEMIPORNOGRAPHY SEPTUAGENARIANS
SINGULARISATION SINGULARIZATION SLEDGEHAMMERING SPERMATOGENESIS
SPERMATOGENETIC SPORANGIOPHORES SPORANGIOSPORES STEGANOGRAPHIES
STEGANOGRAPHIST STRAITJACKETING STRIKEBREAKINGS STRUCTURALISING
STRUCTURALIZING SUBAGGREGATIONS SUBCATEGORISING SUBCATEGORIZING
SUBCONTRACTINGS SUBORGANISATION SUBORGANIZATION SUPEREROGATIONS
SUPERHUMANISING SUPERHUMANIZING SUPERORDINATING SUPERORGANICISM
SUPERORGANICIST SUPERSATURATING SUSPERCOLLATING SYNERGISTICALLY
TERATOGENICISTS TERGIVERSATIONS TETRASPORANGIUM THANATOGRAPHIES
THEATRICALISING THEATRICALIZING TRANQUILISINGLY TRANQUILIZINGLY
TRANSFIGURATION TRANSFIGUREMENT TRANSGENDERISMS TRANSGRESSIONAL
TRANSGRESSIVELY TRANSISTORISING TRANSISTORIZING TRANSLITERATING
TRANSMIGRATIONS TRANSMOGRIFYING TRIANGULARITIES TRIGONOMETRICAL
ULTRACENTRIFUGE UNAPPROPRIATING UNCATEGORISABLE UNCATEGORIZABLE
UNCHRONOLOGICAL UNCOPYRIGHTABLE UNDERDIAGNOSING UNDERESTIMATING
UNDERSTANDINGLY UNGENTLEMANLIER UNGRAMMATICALLY UNORIGINALITIES
UNSPARINGNESSES UNTHREATENINGLY UNTRANSMIGRATED UTEROGESTATIONS
VERNACULARISING VERNACULARIZING WEATHERBOARDING WEATHERPROOFING
ZYGOBRANCHIATES