There are 468 fifteen-letter words containing A, 3E and R, https://www.bestwordlist.com/c/a/5/15letterwordswithaeeer.htm ACCESSARINESSES ACCESSORINESSES ADMIRABLENESSES ADRENALECTOMIES ADVERSARINESSES AFTERTREATMENTS AGGREGATENESSES AGREEABLENESSES ALLERGENICITIES ALTERNATIVENESS AMBIDEXTERITIES ANDROSTENEDIONE ANTHROPOGENESES APPRENTICEMENTS ARCHAEOPTERYXES ASSERTIVENESSES ATHEROSCLEROSES BALNEOTHERAPIES BAREFACEDNESSES BEARDLESSNESSES BENZANTHRACENES BENZENECARBONYL BLETHERANSKATES BRAINLESSNESSES BREAKABLENESSES BROKENHEARTEDLY CARPETBAGGERIES CENTRICALNESSES CHOLESTEROLEMIA CHOLINESTERASES CLEARHEADEDNESS COLDHEARTEDNESS COLORABLENESSES COMPLEMENTARIES COMRADELINESSES CONQUERABLENESS CONSECRATEDNESS CONSIDERATENESS CONTEMPERATURES CONVERSABLENESS COOPERATIVENESS CORPORATENESSES CORPOREALNESSES CORRELATIVENESS COUNTEREXAMPLES COUNTERFEISANCE COUNTERFESAUNCE COUNTERMEASURES CRESTFALLENNESS DAGUERREOTYPERS DAGUERREOTYPIES DANGEROUSNESSES DEDIFFERENTIATE DEFENESTRATIONS DEGENERATIONIST DEGRADINGNESSES DEMISEMIQUAVERS DEPARTMENTALISE DEPARTMENTALIZE DESIRABLENESSES DESPERATENESSES DETERMINATENESS DETERMINATIVELY DETERRABILITIES DEUTERANOMALIES DEXFENFLURAMINE DIASTEREOISOMER DISENTRANCEMENT DISFEATUREMENTS DISHEARTENMENTS DISINTERMEDIATE DISPARATENESSES DISTEMPERATURES DOWNHEARTEDNESS DREADLESSNESSES DREAMLESSNESSES DRINKABLENESSES ECCLESIOLATRIES ECCREMOCARPUSES ECLAIRCISSEMENT ELABORATENESSES ELECTROANALYSES ELECTROCHEMICAL ELECTRODIALYSES ELECTROGRAPHIES ELECTROMAGNETIC ELECTROMETRICAL ELECTROMOTANCES ELECTRONEGATIVE ELECTROVALENCES ELECTROVALENTLY ELEUTHERODACTYL ELEUTHEROMANIAS ELEUTHEROPHOBIA EMBRACINGNESSES EMPIRICALNESSES ENDEARINGNESSES ENDURABLENESSES ENFRANCHISEMENT ENGRAINEDNESSES ENTEROBACTERIAL ENTEROBACTERIUM ENTEROGASTRONES ENTEROHEPATITIS ENTREPRENEURIAL ENUMERABILITIES EPEIROGENICALLY EPHEMERALNESSES EPHEMEROPTERANS EQUIPONDERANCES ESTRANGEDNESSES ETHEREALISATION ETHEREALIZATION EVANGELISTARIES EVERLASTINGNESS EXACERBESCENCES EXAGGERATEDNESS EXECRABLENESSES EXEMPLARINESSES EXPERIENTIALISM EXPERIENTIALIST EXPERIMENTALISE EXPERIMENTALISM EXPERIMENTALIST EXPERIMENTALIZE EXPERIMENTATION EXPERIMENTATIVE EXTEMPORARINESS FAVORABLENESSES FEATHERBEDDINGS FEATHERSTITCHED FEATHERSTITCHES FEATURELESSNESS FERROMANGANESES FILTRABLENESSES FORMATIVENESSES FORTUNATENESSES FRANGIBLENESSES GENTLEWOMANLIER GINGERBREADIEST GLYCERALDEHYDES GOVERNMENTALISE GOVERNMENTALIZE GRACELESSNESSES GRANDIOSENESSES HAEMACYTOMETERS HAEMOCYTOMETERS HALFHEARTEDNESS HARDHEARTEDNESS HEADMASTERLIEST HEADMISTRESSIER HEARTBROKENNESS HEARTLESSNESSES HEARTSICKNESSES HEARTSOMENESSES HERESIOGRAPHERS HERESIOGRAPHIES HERESTHETICIANS HERMENEUTICALLY HETEROCERCALITY HETERONORMATIVE HETEROSCEDASTIC HETEROSEXUALITY HEXACHLORETHANE HEXACHLOROPHENE HONORABLENESSES HYPERAESTHESIAS HYPERAGGRESSIVE HYPERVENTILATED HYPERVENTILATES ILLIBERALNESSES IMPERMEABLENESS IMPERVIABLENESS IMPREGNABLENESS INALTERABLENESS INAPPREHENSIBLE INCURABLENESSES INDETERMINACIES INDETERMINATELY INERRABLENESSES INGRAINEDNESSES INHERITABLENESS INNUMERABLENESS INOPERATIVENESS INSEPARABLENESS INSUPERABLENESS INTEMPERATENESS INTERCHANGEABLE INTERCHANGEMENT INTERCOLLEGIATE INTERCORRELATED INTERCORRELATES INTERGENERATION INTERPENETRABLE INTERPENETRATED INTERPENETRATES INTERPERCEPTUAL INTERPERMEATING INTERTANGLEMENT INTERVALOMETERS INTERWEAVEMENTS INTOLERABLENESS INTRICATENESSES IRASCIBLENESSES IRREDEEMABILITY IRREFUTABLENESS IRREMOVABLENESS IRREPARABLENESS IRREVOCABLENESS IRRITABLENESSES ITERATIVENESSES KATATHERMOMETER KINDERGARTENERS KINDHEARTEDNESS KINESITHERAPIES LEGERDEMAINISTS LIONHEARTEDNESS LUCRATIVENESSES MACRENCEPHALIES MAGNETOELECTRIC MARVELOUSNESSES MASTERFULNESSES MEASURELESSNESS MECHANORECEPTOR MEGAVERTEBRATES MEMORABLENESSES MENISPERMACEOUS MERCENARINESSES MERCURIALNESSES METATHEORETICAL MISAPPREHENSIVE MISERABLENESSES MISMEASUREMENTS MOMENTARINESSES MOUNTEBANKERIES NEARSIGHTEDNESS NECESSARINESSES NEFARIOUSNESSES NEOARSPHENAMINE NEOCONSERVATIVE NEUROECTODERMAL NONCREDENTIALED NONEXPERIMENTAL NONHETEROSEXUAL NORMATIVENESSES NORTHEASTERLIES NORTHEASTERNERS NOVOCENTENARIES OCTOCENTENARIES OPENHEARTEDNESS OPERATIVENESSES OVERACCENTUATED OVERACCENTUATES OVERACHIEVEMENT OVERALERTNESSES OVERASSESSMENTS OVERBEARINGNESS OVERCENTRALISED OVERCENTRALISES OVERCENTRALIZED OVERCENTRALIZES OVERCOMPENSATED OVERCOMPENSATES OVEREAGERNESSES OVEREARNESTNESS OVERENTERTAINED OVEREXAGGERATED OVEREXAGGERATES OVEREXPECTATION OVEREXTRAPOLATE OVEREXUBERANTLY OVERGENERALISED OVERGENERALISES OVERGENERALIZED OVERGENERALIZES OVERHASTINESSES OVERMANAGEMENTS OVERORCHESTRATE OVERSPECIALISED OVERSPECIALISES OVERSPECIALIZED OVERSPECIALIZES OVERZEALOUSNESS PAINTERLINESSES PAMPHLETEERINGS PARALLELEPIPEDA PARALLELEPIPEDS PARTHENOGENESES PARTHENOGENESIS PARTHENOGENETIC PECTINESTERASES PENETRABILITIES PENETRATIVENESS PERGAMENTACEOUS PERIHEPATITISES PERIPHERALITIES PERMANENTNESSES PERMEABLENESSES PERVASIVENESSES PLEASURABLENESS PNEUMATOMETRIES PRAYERFULNESSES PREADOLESCENCES PREANAESTHETICS PREANNOUNCEMENT PREARRANGEMENTS PRECIPITATENESS PREDATORINESSES PREDETERMINABLE PREDICTABLENESS PREEXPERIMENTAL PREFERABILITIES PREFERENTIALISM PREFERENTIALIST PREFERENTIALITY PREKINDERGARTEN PREMATURENESSES PREPERFORMANCES PREPONDERANCIES PREPRESIDENTIAL PRESBYTERIANISE PRESBYTERIANIZE PRESENTABLENESS PRESENTIALITIES PREVALENTNESSES PRINTABLENESSES PROCREATIVENESS PROXIMATENESSES PSEUDOMEMBRANES PYRETOTHERAPIES QUARRELSOMENESS QUATERCENTENARY QUINCENTENARIES QUINGENTENARIES RADIOTELEMETERS RADIOTELEMETRIC RADIOTELEPHONED RADIOTELEPHONES REACCELERATIONS READVERTISEMENT READVERTIZEMENT REAPPRAISEMENTS RECEIVABILITIES RECHOREOGRAPHED RECONCEPTUALISE RECONCEPTUALIZE RECONTEXTUALISE RECONTEXTUALIZE RECONVALESCENCE RECOVERABLENESS RECTIPETALITIES REDEEMABILITIES REDETERMINATION REDOUBTABLENESS REESTABLISHMENT REFRACTOMETRIES REFRANGIBLENESS REFRIGERATORIES REGARDFULNESSES REMEDIABILITIES REMEMBERABILITY REMOVABLENESSES REPEATABILITIES REPRESENTATIONS REPRESENTATIVES RESECTABILITIES RESPECTABILISED RESPECTABILISES RESPECTABILIZED RESPECTABILIZES RESPECTABLENESS RETRIEVABLENESS RETROACTIVENESS RETROPERITONEAL REVEALABILITIES REVEALINGNESSES REVERBERATORIES REVOCABLENESSES RIGHTABLENESSES ROLLERCOASTERED ROUNDHEADEDNESS SCLEROTHERAPIES SEARCHINGNESSES SEAWORTHINESSES SECONDARINESSES SEDENTARINESSES SEMITERRESTRIAL SEPARABLENESSES SEROPREVALENCES SERVICEABLENESS SESQUICENTENARY SLEDGEHAMMERING SOFTHEARTEDNESS SOUTHEASTERLIES SOUTHEASTERNERS SPELEOTHERAPIES SPERMATOGENESES SPERMATOGENESIS SPERMATOGENETIC SPHAEROSIDERITE SPHERICALNESSES SUPERABLENESSES SUPERCALENDERED SUPERELEVATIONS SUPERLATIVENESS SUPERNUMERARIES SUPERSPECTACLES SUPPLEMENTARIES TEMERARIOUSNESS TEMPERABILITIES TEMPERAMENTALLY TEMPERATENESSES TEMPORARINESSES TENDERHEARTEDLY TERRESTRIALNESS TETRAETHYLLEADS TETRAMETHYLLEAD THERMAESTHESIAS THERMOBAROMETER THERMOREGULATED THERMOREGULATES THERMOREMANENCE THERMOTHERAPIES THORACOCENTESES TOLERABLENESSES TRACEABLENESSES TRACKLESSNESSES TRACTABLENESSES TRANSCENDENCIES TRANSIENTNESSES TREACHEROUSNESS TREASONABLENESS TRUEHEARTEDNESS UNALTERABLENESS UNAPPREHENSIBLE UNCERTAINNESSES UNCREATEDNESSES UNDEREMPHASISED UNDEREMPHASISES UNDEREMPHASIZED UNDEREMPHASIZES UNDERGRADUETTES UNDERHANDEDNESS UNDERSTATEMENTS UNDESIRABLENESS UNEARTHLINESSES UNENDURABLENESS UNGENTLEMANLIER UNGUARDEDNESSES UNINTERPRETABLE UNIVERSALNESSES UNLEARNEDNESSES UNNECESSARINESS UNRECOMMENDABLE UNUTTERABLENESS UNWEARIEDNESSES UTTERABLENESSES VENERABLENESSES VERACIOUSNESSES VERITABLENESSES VERSATILENESSES VESTIMENTIFERAN WARMHEARTEDNESS WASTERFULNESSES WATERLESSNESSES WEARISOMENESSES WEATHERLINESSES WRONGHEADEDNESS