There are 607 twelve-letter words containing A, E, F and N, https://www.bestwordlist.com/c/a/4/12letterwordswithaefn.htm ACRIFLAVINES ADVENTUREFUL AERIFICATION AFFECTATIONS AFFECTEDNESS AFFECTIONATE AFFECTIONING AFFLUENTIALS AFFLUENTNESS AFFORCEMENTS AFFRANCHISED AFFRANCHISES AFFRIGHTENED AFFRIGHTMENT AFTERBURNERS AFTERBURNING AIRCRAFTSMEN AMENTIFEROUS ANGLERFISHES ANTIFEBRILES ANTIFEMININE ANTIFEMINISM ANTIFEMINIST ARFVEDSONITE ARTFULNESSES ASSUEFACTION BATTLEFRONTS BENEFACTIONS BENEFACTRESS BENEFICIALLY BENEFICIATED BENEFICIATES BLAMEFULNESS BLUESNARFING BOASTFULNESS BRASSFOUNDER BREAKFASTING CAFFEINATING CALEFACIENTS CALEFACTIONS CANDLEFISHES CANDYFLOSSES CAREFREENESS CEFTRIAXONES CENTRIFUGALS CHAUFFEURING CHAUFFEUSING CHIEFTAINESS CLIFFHANGERS CODEFENDANTS CONFABULATED CONFABULATES CONFEDERATED CONFEDERATES CONFERENTIAL CONFESSIONAL CONFIDENTIAL CONFIGURATED CONFIGURATES CONFIRMATIVE CONFLAGRATED CONFLAGRATES CONFORMANCES CONFOUNDABLE CONFRATERNAL COUNTERSHAFT CRAFTINESSES CRAFTSPERSON DANDRUFFIEST DEACIDIFYING DECAFFEINATE DECALCIFYING DEFAECATIONS DEFALCATIONS DEFENESTRATE DEFENSATIVES DEFIBRINATED DEFIBRINATES DEFILIATIONS DEFINABILITY DEFINITIONAL DEFLAGRATING DEFLAGRATION DEFLATIONARY DEFLATIONIST DEFLECTIONAL DEFLOCCULANT DEFLORATIONS DEFOLIATIONS DEFORCIATION DEFORMATIONS DEFRAGMENTED DEFRAGMENTER DEFRAUDATION DEFRAUDMENTS DEIFICATIONS DESANCTIFIED DESANCTIFIES DIBENZOFURAN DIFFERENTIAE DIFFERENTIAL DIFFRANGIBLE DISAFFECTING DISAFFECTION DISFEATURING DISFRANCHISE DISINFECTANT DISINFESTANT DRAFTINESSES DRAFTSPERSON DRAGONFISHES DREADFULNESS DREAMFULNESS DWARFISHNESS EDIFICATIONS EFFECTUATING EFFECTUATION EFFEMINACIES EFFEMINATELY EFFEMINATING EFFIGURATION EFFLEURAGING ENFRAMEMENTS ENFRANCHISED ENFRANCHISER ENFRANCHISES ENGRAFTATION ENGRAFTMENTS ENTOMOFAUNAE ENTOMOFAUNAS EXFILTRATING EXFILTRATION EXFOLIATIONS EXSUFFLATING EXSUFFLATION FABULOUSNESS FACELESSNESS FACEPLANTING FACILENESSES FACSIMILEING FACTIONALISE FACTIONALIZE FACTIONARIES FACTIOUSNESS FAINEANTISES FAINTHEARTED FAINTISHNESS FAIRNITICKLE FAIRNITICLES FAIRNYTICKLE FAIRNYTICLES FAITHFULNESS FALLENNESSES FALLIBLENESS FALLOWNESSES FAMILIARNESS FAMOUSNESSES FANCIFULNESS FANFARONADED FANFARONADES FANTASTICATE FANTASTICOES FARCICALNESS FARNARKELING FARTHINGALES FARTHINGLESS FASCINATEDLY FASHIONABLES FASHIOUSNESS FATHERLINESS FAULTFINDERS FAULTINESSES FAVOUREDNESS FEARLESSNESS FEARSOMENESS FEASIBLENESS FEATHERBRAIN FEATHERINESS FEATLINESSES FEBRIFACIENT FECUNDATIONS FEDERALISING FEDERALIZING FELICITATING FELICITATION FEMALENESSES FEMINALITIES FEMINISATION FEMINIZATION FENESTRATING FENESTRATION FENFLURAMINE FERMENTATION FERMENTATIVE FERRICYANIDE FERRIMAGNETS FERROCYANIDE FERROMAGNETS FERTIGATIONS FESTINATIONS FIANCHETTOED FIANCHETTOES FIBERISATION FIBERIZATION FICTIONALISE FICTIONALIZE FILIALNESSES FILLAGREEING FINANCIERING FINASTERIDES FINEABLENESS FINGERBOARDS FINGERGUARDS FINGERPLATES FINGERSTALLS FINICALITIES FIRESCAPINGS FISSIONABLES FLABBINESSES FLABELLATION FLAGELLATING FLAGELLATION FLAGGINESSES FLAGRANTNESS FLAMBOYANCES FLAMBOYANTES FLANNELBOARD FLANNELETTES FLANNELGRAPH FLANNELLIEST FLASHINESSES FLATTERINGLY FLATULENCIES FLAUGHTERING FLAVOPROTEIN FLAWLESSNESS FLEXITARIANS FLIPPANTNESS FLUCONAZOLES FLUPHENAZINE FLUVIOMARINE FLUVOXAMINES FOMENTATIONS FONTINALISES FOOTBALLENES FOOTPLATEMAN FOOTPLATEMEN FORAMINIFERA FORAMINIFERS FORBEARANCES FORBEARINGLY FORBIDDANCES FORECASTINGS FOREHANDEDLY FOREKNOWABLE FOREMANSHIPS FORENSICALLY FOREORDAINED FOREPAYMENTS FOREPLANNING FOREREACHING FOREREADINGS FORESLACKING FORESPEAKING FORESTALLING FORESTALMENT FORESTATIONS FORESWEARING FORETEACHING FORETRIANGLE FOREWARNINGS FORGATHERING FORMALNESSES FORNICATRESS FORSAKENNESS FORTEPIANIST FORWANDERING FOUNDATIONER FOUNTAINHEAD FOUNTAINLESS FRACTIONATED FRACTIONATES FRACTIONISED FRACTIONISES FRACTIONIZED FRACTIONIZES FRACTIONLETS FRAGMENTALLY FRAGMENTATED FRAGMENTATES FRAGMENTISED FRAGMENTISES FRAGMENTIZED FRAGMENTIZES FRAGRANTNESS FRANCOPHILES FRANCOPHOBES FRANCOPHONES FRANKFURTERS FRANKINCENSE FRANKLINITES FRANKPLEDGES FRATERNALISM FRATERNISERS FRATERNISING FRATERNITIES FRATERNIZERS FRATERNIZING FRAUDULENCES FRAUDULENTLY FREAKINESSES FREAKISHNESS FREEHANDEDLY FREELOADINGS FREESTANDING FRENETICALLY FREQUENTABLE FRESHMANSHIP FRICASSEEING FRONTALITIES FRONTIERSMAN FRUGALNESSES FRUMENTATION FUNAMBULATED FUNAMBULATES FUNCTIONATED FUNCTIONATES FUNDAMENTALS FURAZOLIDONE FURTHERANCES GEMEINSCHAFT GLANDIFEROUS GODFATHERING GONFALONIERS GRACEFULNESS GRANDFATHERS GRASSFINCHES GRATEFULNESS HALFENDEALES HALLEFLINTAS HAMFATTERING HANDICRAFTER HANDKERCHIEF HASENPFEFFER HENCEFORWARD HERPETOFAUNA IDENTIFIABLE IDENTIFIABLY INDEFEASIBLE INDEFEASIBLY INDEFINABLES INEFFABILITY INEFFACEABLE INEFFACEABLY INEFFICACIES INEFFICACITY INFAMOUSNESS INFANGTHIEFS INFANTICIDES INFANTILISED INFANTILISES INFANTILIZED INFANTILIZES INFATUATEDLY INFESTATIONS INFEUDATIONS INFILTRATIVE INFLAMMABLES INFLATEDNESS INFLECTIONAL INFLUENTIALS INFOMERCIALS INFORMATISED INFORMATISES INFORMATIZED INFORMATIZES INFORMIDABLE INFOTAINMENT INFRACLASSES INGRAFTMENTS INSUFFERABLE INSUFFERABLY INTERFACINGS INTERFACULTY INTERFEMORAL INTERFLUVIAL INTERFOLIATE INTERFRONTAL INTERGRAFTED INTERTRAFFIC JALOALLOFANE LABEFACTIONS LAWFULNESSES LEAFLESSNESS LEAPFROGGING LIFEGUARDING LIFEMANSHIPS LIQUEFACIENT LIQUEFACTION LOATHFULNESS MADEFACTIONS MAGNIFICENCE MALEFACTIONS MALEFICENCES MALFEASANCES MANFULNESSES MANIFESTABLE MANIFESTANTS MANIFESTIBLE MANIFESTNESS MANIFESTOING MANIFOLDNESS MANUFACTURED MANUFACTURER MANUFACTURES MEANINGFULLY METAFICTIONS METRIFONATES MICROFINANCE MIDAFTERNOON MISCHANCEFUL MISFEASANCES MISFEATURING MONOFILAMENT MYOFILAMENTS NEEDLECRAFTS NEUROFIBROMA NEWFANGLEDLY NONFACULTIES NONFATTENING NONFEASANCES NONFEDERATED NONFLAMMABLE OAFISHNESSES OUTFANGTHIEF OVERFAVORING OVERINFLATED OVERINFLATES OVERSTAFFING PARAFFINIEST PEACEFULNESS PERFECTATION PERFOLIATION PERFORATIONS PERFORMANCES PETRIFACTION PLACENTIFORM PONTIFICATED PONTIFICATES PREACHIFYING PREFERENTIAL PREFINANCING PREFLORATION PREFOLIATION PREFORMATION PROFESSIONAL PROOFREADING PUFTALOONIES PUTREFACIENT PUTREFACTION QUANTIFIABLE QUARTERFINAL RANGEFINDERS RANGEFINDING RAREFACTIONS RAREFICATION REFASHIONING REFECTORIANS REFINANCINGS REFLATIONARY REFLECTANCES REFLECTIONAL REFORMATIONS REFORMATTING REFOUNDATION REFRACTURING REFRAINMENTS REFRIGERANTS REIFICATIONS REINFLATIONS REQUALIFYING RETRANSFORMS RETRANSFUSED RETRANSFUSES RIBOFLAVINES RIFACIMENTOS RUBEFACIENTS RUBEFACTIONS SAFECRACKING SAFEGUARDING SAFEKEEPINGS SANCTIFIABLE SANCTIFIEDLY SANGUIFEROUS SAPONIFIABLE SATINFLOWERS SCIENTIFICAL SCREENCRAFTS SELFSAMENESS SEMIFINALIST SHAMEFULNESS SIGNIFICANCE SIGNIFICATES SINFONIETTAS SOMNIFACIENT SORBEFACIENT SPACEFARINGS SPEARFISHING STANNIFEROUS STEDFASTNESS STUPEFACIENT STUPEFACTION SUBFEUDATION SUBFRAGMENTS SUBINFEUDATE SULFADIAZINE SULFADOXINES SULFONAMIDES SULFONYLUREA SULFORAPHANE SUPERFRONTAL TABEFACTIONS TASTEFULNESS TEASPOONFULS TEASPOONSFUL TEPEFACTIONS TERRAFORMING THANKFULLEST THANKFULNESS THEREINAFTER THUNDERFLASH TITANIFEROUS TORREFACTION TRANSFECTING TRANSFECTION TRANSFERABLE TRANSFERASES TRANSFERENCE TRANSFERRALS TRANSFERRERS TRANSFERRING TRANSFERRINS TRANSFIGURED TRANSFIGURES TRANSFORMERS TRANSFUSABLE TRANSFUSIBLE TRYPAFLAVINE TUMEFACTIONS ULTRAREFINED UNAFFECTEDLY UNAFFILIATED UNAFFORDABLE UNBENEFICIAL UNCLASSIFIED UNCONFINABLE UNDEFEATABLE UNDEFOLIATED UNDERSTAFFED UNDERSURFACE UNFADINGNESS UNFAIRNESSES UNFATHERLIER UNFATHOMABLE UNFAVOURABLE UNFEUDALISED UNFEUDALISES UNFEUDALIZED UNFEUDALIZES UNFILTERABLE UNFLATTERING UNFOREWARNED UNFORGIVABLE UNFORMALISED UNFORMALIZED UNFORMIDABLE UNFORMULATED UNFORTUNATES UNFRANCHISED UNGRACEFULLY UNGRATEFULLY UNIFOLIOLATE UNLAWFULNESS UNMODIFIABLE UNPEACEFULLY UNPERFORATED UNPROFITABLE UNQUANTIFIED UNREFORMABLE UNSAFENESSES UNSANCTIFIED UNSANCTIFIES UNSTRATIFIED UNSUFFERABLE UNVERIFIABLE UNVERIFIABLY VERIFICATION VOCIFERANCES VOCIFERATING VOCIFERATION WASTEFULNESS WATCHFULNESS WATERFINDERS WATERFOWLING WEARIFULNESS WINEGLASSFUL WRATHFULNESS