There are 421 fourteen-letter words containing 2A, 2E and N, https://www.bestwordlist.com/c/a/5/14letterwordswithaaeen.htm
ABOMINABLENESS ABRASIVENESSES ABSORBEFACIENT ABSTRACTEDNESS ABSTRACTNESSES
ACCELERATINGLY ACCENTUALITIES ACCEPTABLENESS ACCIDENTALNESS ACCURATENESSES
ACETAMINOPHENS ACINETOBACTERS ADAPTIVENESSES ADEQUATENESSES ADMEASUREMENTS
ADORABLENESSES ADRENERGICALLY ADULARESCENCES AERENCHYMATOUS AEROELASTICIAN
AEROGENERATORS AEROHYDROPLANE AEROMECHANICAL AFFECTIONATELY AFTERSENSATION
AFTERTREATMENT AGGRANDISEMENT AGGRANDIZEMENT ALIENABILITIES ALKALESCENCIES
AMATEURISHNESS AMBULANCEWOMEN AMENABLENESSES AMICABLENESSES AMINOPEPTIDASE
AMINOPHENAZONE ANAESTHETISING ANAESTHETIZING ANELASTICITIES ANESTHETICALLY
ANSWERABLENESS ANTEPENULTIMAS ANTIALLERGENIC ANTIDEPRESSANT ANTIDERIVATIVE
ANTIFEDERALIST ANTIMANAGEMENT ANTIMARKETEERS ANTIMETABOLITE ANTIMETATHESES
ANTIMETATHESIS ANTIPERISTASES ANTIQUATEDNESS APPARENTNESSES APPERTAINANCES
APPERTAINMENTS APPLICABLENESS ARCHDEACONRIES ARCHEOBOTANIES ARCHGENETHLIAC
ARTICULATENESS ASCERTAINMENTS ASSAULTIVENESS ASSEVERATINGLY ATTAINABLENESS
ATTRACTIVENESS AUGMENTATIVELY AVOWABLENESSES BACKHANDEDNESS BACKWARDNESSES
BANDERSNATCHES BEARABLENESSES BENZANTHRACENE BLAMABLENESSES BLETHERANSKATE
CADAVEROUSNESS CALCULATEDNESS CALYCANTHEMIES CANCELLARIATES CARBAMAZEPINES
CATECHOLAMINES CATECHUMENATES CATECHUMENICAL CENTENARIANISM CHANGEABLENESS
CHARGEABLENESS CHARITABLENESS CLAIRAUDIENCES CLEANABILITIES COENAESTHESIAS
COMPARABLENESS CONTEMPORANEAN CONVERTAPLANES CORYNEBACTERIA COUNTERBALANCE
CRANIOCEREBRAL CYANOACETYLENE CYANOETHYLATED CYANOETHYLATES CYANOGENAMIDES
DAMNABLENESSES DATAVEILLANCES DECAFFEINATING DECONTAMINATED DECONTAMINATES
DENATIONALISED DENATIONALISES DENATIONALIZED DENATIONALIZES DEPARTMENTALLY
DEREALISATIONS DEREALIZATIONS DEXAMETHASONES DEXAMPHETAMINE DIAGENETICALLY
DIAPHANOMETERS DIATHERMANCIES DIATHERMANEITY DIEFFENBACHIAS DINOFLAGELLATE
DISAPPEARANCES DISARRANGEMENT DISINCARCERATE DISPARAGEMENTS ELEUTHEROMANIA
EMBARRASSMENTS EMPHATICALNESS ENANTIOPATHIES ENCEPHALALGIAS ENCEPHALOGRAMS
ENCEPHALOGRAPH ENCEPHALOPATHY ENCYCLOPAEDIAS ENDOTHELIOMATA ENTEROBACTERIA
ENTHYMEMATICAL ETERNALISATION ETERNALIZATION EUPHAUSIACEANS EVANGELIARIONS
EVANGELIARIUMS EVANGELICALISM EVANGELISATION EVANGELIZATION EXAGGERATINGLY
EXASPERATINGLY EXTRAFORANEOUS EXTRAORDINAIRE EXTRAVAGANCIES FAINTHEARTEDLY
FAMILIARNESSES FARCICALNESSES FATIGUABLENESS FAVOURABLENESS FEATHERBRAINED
FEDERALISATION FEDERALIZATION FERROMAGNESIAN FERROMANGANESE FLAGRANTNESSES
FRAGRANTNESSES GALVANOMETRIES GENEALOGICALLY GENERALISATION GENERALIZATION
GENERATIONALLY GENETHLIACALLY GRADABLENESSES GYNAECOCRACIES GYNAECOMASTIES
HABITUALNESSES HAEMATOGENESES HAEMATOGENESIS HAEMATOGENETIC HALTERBREAKING
HARDHANDEDNESS HARDHEADEDNESS HEADQUARTERING HEMAGGLUTINATE HEPATOPANCREAS
HEXOSAMINIDASE HYPERAWARENESS HYPERNATRAEMIA HYPOMAGNESEMIA IMAGINABLENESS
IMMACULATENESS IMMATERIALNESS IMPASSABLENESS IMPLACABLENESS INACCURATENESS
INADEQUATENESS INAPPRECIATIVE INSATIABLENESS INTERAVAILABLE INTERDIALECTAL
INTERJACULATED INTERJACULATES INTERLAMINATED INTERLAMINATES INTERMARRIAGES
INTERPLANETARY INTRANSIGEANCE INVALUABLENESS INVARIABLENESS IRRESTRAINABLE
LABRADORESCENT LAMENTABLENESS LAUDABLENESSES LAXATIVENESSES LEARNABILITIES
MACRENCEPHALIA MAJESTICALNESS MALAPERTNESSES MANAGEABLENESS MARKETABLENESS
MATERIALNESSES MEASURABLENESS MECHANICALNESS MECHANOTHERAPY MEDICAMENTALLY
METANARRATIVES MISARRANGEMENT MISMANAGEMENTS NEANDERTHALERS NEANDERTHALOID
NEBUCHADNEZZAR NECESSARIANISM NECESSITARIANS NEMATODIRIASES NEURAMINIDASES
NEURASTHENIACS NEUROANATOMIES NEWSPAPERWOMAN NONACCEPTANCES NONAPPEARANCES
NONATTENDANCES NONCANCELLABLE NONHALOGENATED NONMANAGEMENTS NONVEGETARIANS
NORADRENALINES OCEANOGRAPHERS OCEANOGRAPHIES OLEOMARGARINES ORACULARNESSES
OVERABUNDANCES OVERACCENTUATE OVEREVALUATING OVEREVALUATION OVERMANAGEMENT
PALAEETHNOLOGY PALAEOBOTANIES PALAEOCURRENTS PALAEOMAGNETIC PALATIALNESSES
PALEOMAGNETISM PALEOMAGNETIST PALINGENETICAL PALPABLENESSES PANAESTHETISMS
PANCREATECTOMY PANCREATITIDES PANCREATITISES PANGENETICALLY PANLEUCOPENIAS
PANLEUKOPENIAS PANRADIOMETERS PANSEXUALITIES PANTALOONERIES PARALEIPOMENON
PARAMETERISING PARAMETERIZING PARDONABLENESS PASSABLENESSES PASSIONATENESS
PASTORALNESSES PEDANTOCRACIES PENEPLANATIONS PENNATULACEOUS PENTADACTYLIES
PENTAVALENCIES PERIMENOPAUSAL PHENYLALANINES PLACABLENESSES PLEASANTNESSES
PREANAESTHETIC PREARRANGEMENT PREDESTINARIAN PREDEVALUATION PREMANUFACTURE
PREMILLENARIAN PREOPERATIONAL PRESENTATIONAL PROLETARIANISE PROLETARIANIZE
PROPAGABLENESS PSEPHOANALYSES QUADRIGEMINATE QUADRIVALENCES QUAESTIONARIES
QUANTIVALENCES RAMAPITHECINES RAMPAGEOUSNESS RATEABLENESSES RATIONALNESSES
REACCELERATING REACCELERATION REACQUAINTANCE READABLENESSES REAGGREGATIONS
REAPPRAISEMENT REARRANGEMENTS REASONABLENESS RECALCITRANCES RECONNAISSANCE
RECONTAMINATED RECONTAMINATES RECREATIONALLY REEXAMINATIONS REMANUFACTURED
REMANUFACTURER REMANUFACTURES REMARKABLENESS RENATIONALISED RENATIONALISES
RENATIONALIZED RENATIONALIZES RESTAURANTEURS REWARDABLENESS RHOMBENCEPHALA
SABERMETRICIAN SACRAMENTARIES SALEABLENESSES SALUTARINESSES SALVABLENESSES
SANITARINESSES SAVEABLENESSES SCALABLENESSES SCATTERBRAINED SCLERENCHYMATA
SEASONABLENESS SEASONALNESSES SEMICARBAZONES SENSATIONALISE SENSATIONALIZE
SEPARATENESSES SEPARATIVENESS SEPTUAGENARIAN SEPTUAGENARIES SESQUIPEDALIAN
SHAMEFACEDNESS STALWARTNESSES STATESMANLIEST STEGANOGRAPHER STEGOCEPHALIAN
SUBAPPEARANCES SUBTERRANEANLY SULFAMETHAZINE SUPERABUNDANCE SUPERTERRANEAN
SUPRASEGMENTAL TAMEABLENESSES TATTERDEMALION TELANGIECTASES TELANGIECTASIA
TELANGIECTASIS TELANGIECTATIC TELEVANGELICAL TESTAMENTARILY TETRAGONALNESS
TETRAVALENCIES THAUMATOGENIES THEATRICALNESS THERMOBALANCES THIABENDAZOLES
THREADBARENESS TRAGICALNESSES TRANSCALENCIES TRANSCENDENTAL TRANSFERENTIAL
TRANSLITERATED TRANSLITERATES TRANSPARENCIES TRANSPARENTISE TRANSPARENTIZE
TRIHALOMETHANE TURANGAWAEWAES UNAFFECTIONATE UNAPPRECIATIVE UNBEARABLENESS
UNDERCARRIAGES UNDERDRAINAGES UNDERGRADUATES UNDERSATURATED UNDERSTANDABLE
UNMARRIAGEABLE UNMATERIALISED UNMATERIALIZED UNMERCHANTABLE UNPASSABLENESS
UNPLEASANTNESS UNPLEASANTRIES UNPURCHASEABLE UNREADABLENESS UNRECAPTURABLE
UNRESTRAINABLE UNSHAKABLENESS UNTAMEABLENESS UNTRANSFERABLE VALERIANACEOUS
VALETUDINARIES VALUABLENESSES VARIABLENESSES VEGETARIANISMS VERNACULARISED
VERNACULARISES VERNACULARIZED VERNACULARIZES VRAISEMBLANCES WEATHERISATION
WEATHERIZATION