There are 749 thirteen-letter words containing A, F and N, https://www.bestwordlist.com/c/a/3/13letterwordswithafn.htm ABORTIFACIENT ACETIFICATION ACIDIFICATION AERIFICATIONS AFFECTIONALLY AFFECTIONLESS AFFECTIVENESS AFFENPINSCHER AFFORESTATION AFFRANCHISING AFFREIGHTMENT AFFRIGHTENING AFFRIGHTMENTS AFTERBURNINGS AIRCRAFTWOMAN AIRCRAFTWOMEN AIRFREIGHTING ALUMINIFEROUS AMPLIFICATION ANFRACTUOSITY ANTENNIFEROUS ANTIAIRCRAFTS ANTIFEMINISMS ANTIFEMINISTS ANTIFERTILITY ANTIFOREIGNER ANTIFORMALISM ANTIFORMALIST AQUAFITNESSES ARFVEDSONITES ARGENTIFEROUS ASSUEFACTIONS ASTROTURFINGS AUTOINFECTION BACKFLIPPINGS BALEFULNESSES BANEFULNESSES BAREFACEDNESS BASHFULNESSES BASIFICATIONS BEATIFICATION BEAUTIFULNESS BENEFICENTIAL BENEFICIARIES BENEFICIATING BENEFICIATION BIOFLAVONOIDS BIOINFORMATIC BLANKETFLOWER BLUESNARFINGS BRANFULNESSES BRASSFOUNDERS BRASSFOUNDING BREASTFEEDING CALCIFICATION CANDLESNUFFER CAPRIFICATION CARBONIFEROUS CAREFULNESSES CARNIFICATION CENTRIFUGALLY CERTIFICATING CERTIFICATION CHANGEFULNESS CHIEFTAINCIES CHIEFTAINRIES CHIEFTAINSHIP CHYLIFICATION CHYMIFICATION CIPROFLOXACIN CITIFICATIONS CITYFICATIONS CLARIFICATION CLIFFHANGINGS COALIFICATION CODIFICATIONS COLORFASTNESS COMPACTIFYING CONFABULATING CONFABULATION CONFABULATORS CONFABULATORY CONFARREATION CONFECTIONARY CONFEDERACIES CONFEDERATING CONFEDERATION CONFEDERATIVE CONFESSIONALS CONFESSIONARY CONFIGURATING CONFIGURATION CONFIGURATIVE CONFIGURATORS CONFIRMATIONS CONFISCATABLE CONFISCATIONS CONFLAGRATING CONFLAGRATION CONFLAGRATIVE CONFORMATIONS CONFRATERNITY CONFRONTATION CONFUSABILITY CONTRAFAGOTTI CONTRAFAGOTTO COREFERENTIAL CORNIFICATION COSURFACTANTS COTRANSFERRED COUNTERSHAFTS CRAFTMANSHIPS CRAFTSMANLIKE CRAFTSMANSHIP CRAFTSPERSONS CRESTFALLENLY CYCLOPARAFFIN DAMNIFICATION DANDIFICATION DECAFFEINATED DECAFFEINATES DECLASSIFYING DECRASSIFYING DEFENESTRATED DEFENESTRATES DEFERENTIALLY DEFEUDALISING DEFEUDALIZING DEFIANTNESSES DEFIBRINATING DEFIBRINATION DEFLAGRATIONS DEFLATIONISTS DEFLOCCULANTS DEFORCIATIONS DEFORESTATION DEFORMALISING DEFORMALIZING DEFORMATIONAL DEFRAGMENTERS DEFRAGMENTING DEFRAUDATIONS DELIRIFACIENT DENSIFICATION DESANCTIFYING DESULFURATING DESULFURATION DIBENZOFURANS DIEFFENBACHIA DIFFARREATION DIFFERENTIALS DIFFERENTIATE DIFUNCTIONALS DIGNIFICATION DISAFFECTIONS DISAFFIRMANCE DISFIGURATION DISFRANCHISED DISFRANCHISES DISFUNCTIONAL DISINFECTANTS DISINFESTANTS DISINFLATIONS DISQUALIFYING DISSATISFYING DRAFTSMANSHIP DRAFTSPERSONS DULCIFICATION DYSFUNCTIONAL EASEFULNESSES EFFECTUALNESS EFFECTUATIONS EFFIGURATIONS ENFRANCHISERS ENFRANCHISING ENGRAFTATIONS EXFILTRATIONS EXSUFFLATIONS FACETIOUSNESS FACILITATIONS FACTIONALISED FACTIONALISES FACTIONALISMS FACTIONALISTS FACTIONALIZED FACTIONALIZES FACTORISATION FACTORIZATION FACTUALNESSES FADDISHNESSES FAIRNITICKLES FAIRNYTICKLES FAITHLESSNESS FALSIFICATION FAMILIARISING FAMILIARIZING FANATICALNESS FANFARONADING FANTASMICALLY FANTASTICALLY FANTASTICATED FANTASTICATES FANTASTICISMS FARADISATIONS FARADIZATIONS FARAWAYNESSES FARNARKELINGS FARTHINGLANDS FASCICULATION FASCINATINGLY FASHIONMONGER FATEFULNESSES FATHEADEDNESS FATIGABLENESS FATUOUSNESSES FAULTFINDINGS FAULTLESSNESS FAUNISTICALLY FAVORABLENESS FAVOREDNESSES FAWNINGNESSES FEARFULNESSES FEARMONGERING FEATHERBRAINS FEATHEREDGING FEBRIFACIENTS FELICITATIONS FEMINISATIONS FEMINIZATIONS FENESTRATIONS FENFLURAMINES FERMENTATIONS FERRICYANIDES FERRICYANOGEN FERRIMAGNETIC FERROCYANIDES FERROCYANOGEN FERROMAGNETIC FERTILISATION FERTILIZATION FETISHISATION FETISHIZATION FEUDALISATION FEUDALIZATION FIANCHETTOING FIBERGLASSING FIBERISATIONS FIBERIZATIONS FIBREGLASSING FIBRILLATIONS FICTIONALISED FICTIONALISES FICTIONALIZED FICTIONALIZES FILTRABLENESS FINABLENESSES FINALISATIONS FINALIZATIONS FINANCIALISTS FINGERBREADTH FINGERGLASSES FINICALNESSES FLABELLATIONS FLACCIDNESSES FLAGELLANTISM FLAGELLATIONS FLAGELLOMANIA FLAMBOYANCIES FLAMEPROOFING FLAMMULATIONS FLANNELBOARDS FLANNELGRAPHS FLASHMOBBINGS FLAUNTINESSES FLAVOPROTEINS FLAVOPURPURIN FLOCCILLATION FLOCCULATIONS FLOWCHARTINGS FLUCTUATIONAL FLUIDISATIONS FLUIDIZATIONS FLUNITRAZEPAM FLUORIDATIONS FLUORINATIONS FLUOROCARBONS FLUPHENAZINES FOCALISATIONS FOCALIZATIONS FONCTIONNAIRE FOOLHARDINESS FOOTDRAGGINGS FORAMINIFERAL FORAMINIFERAN FOREGATHERING FORENSICALITY FOREORDAINING FORESHADOWING FORESTALLINGS FORESTALLMENT FORESTALMENTS FORETRIANGLES FOREWARNINGLY FORMALISATION FORMALIZATION FORMATIVENESS FORMULARISING FORMULARIZING FORTEPIANISTS FORTIFICATION FORTUNATENESS FORWARDNESSES FOSSILISATION FOSSILIZATION FOUNDATIONARY FOUNDATIONERS FOUNTAINHEADS FRACTIONALISE FRACTIONALISM FRACTIONALIST FRACTIONALIZE FRACTIONATING FRACTIONATION FRACTIONATORS FRACTIONISING FRACTIONIZING FRACTIOUSNESS FRAGILENESSES FRAGMENTARILY FRAGMENTATING FRAGMENTATION FRAGMENTISING FRAGMENTIZING FRANCHISEMENT FRANCISATIONS FRANCIZATIONS FRANCOPHOBIAS FRANGIBLENESS FRANKALMOIGNS FRANKINCENSES FRANTICNESSES FRATERNALISMS FRAUDULENCIES FREEMASONRIES FREQUENTATION FREQUENTATIVE FRESHMANSHIPS FRIABLENESSES FROWARDNESSES FRUITARIANISM FRUMENTACEOUS FRUMENTARIOUS FRUMENTATIONS FRUSTRATINGLY FUGACIOUSNESS FUNAMBULATING FUNAMBULATION FUNAMBULATORS FUNAMBULATORY FUNCTIONALISM FUNCTIONALIST FUNCTIONALITY FUNCTIONARIES FUNCTIONATING FUNDAMENTALLY FURACIOUSNESS FURAZOLIDONES FUSTILLIRIANS FUTILITARIANS GAINFULNESSES GAMIFICATIONS GARNETIFEROUS GASIFICATIONS GEMEINSCHAFTS GIFTWRAPPINGS GLADFULNESSES GLORIFICATION GRANDFATHERED GRANDFATHERLY GRANULIFEROUS GRATIFICATION HANDCRAFTSMAN HANDCRAFTSMEN HANDICRAFTERS HANDKERCHIEFS HARMFULNESSES HASENPFEFFERS HATEFULNESSES HEALTHFULNESS HENCEFORWARDS HERPETOFAUNAE HERPETOFAUNAS HIGHFALUTINGS HONORIFICALLY HORRIFICATION HUMIFICATIONS HYPERINFLATED ICHTHYOFAUNAE ICHTHYOFAUNAL ICHTHYOFAUNAS IMMUNIFACIENT IMPERFORATION INDEFATIGABLE INDEFATIGABLY INEFFABLENESS INEFFECTUALLY INEFFICACIOUS INFALLIBILISM INFALLIBILIST INFALLIBILITY INFANTILISING INFANTILITIES INFANTILIZING INFEASIBILITY INFERENTIALLY INFERNALITIES INFIBULATIONS INFILTRATIONS INFINITESIMAL INFINITIVALLY INFLAMMATIONS INFLATIONISMS INFLATIONISTS INFLEXIONALLY INFLUENCEABLE INFLUENTIALLY INFORMALITIES INFORMATICIAN INFORMATIONAL INFORMATISING INFORMATIVELY INFORMATIZING INFORMATORILY INFOTAINMENTS INFRAPOSITION INFRASPECIFIC INFUNDIBULATE INFURIATINGLY INGRAFTATIONS INSIGNIFICANT INSUFFLATIONS INTERFACIALLY INTERFAMILIAL INTERFEROGRAM INTERFOLIATED INTERFOLIATES INTERGRAFTING INTERSTRATIFY INTERTRAFFICS INTRASPECIFIC IRREFRANGIBLE IRREFRANGIBLY JALOALLOFANES JELLIFICATION JOLLIFICATION JUSTIFICATION LABEFACTATION LIGHTFASTNESS LIGNIFICATION LIQUEFACIENTS LIQUEFACTIONS LIQUIFACTIONS LITHIFICATION MAGNIFICATION MAGNIFICENCES MAGNIFICENTLY MALFORMATIONS MALFUNCTIONED MANGANIFEROUS MANIFESTATION MANIFESTATIVE MANUFACTORIES MANUFACTURERS MANUFACTURING MASSIFICATION MASTERFULNESS MELLIFICATION METAFICTIONAL METRIFICATION MICROFILAMENT MICROFINANCES MIDAFTERNOONS MINIFICATIONS MISFORMATIONS MISINFORMANTS MODIFICATIONS MOLLIFICATION MONOFILAMENTS MORTIFICATION MULTIFILAMENT MUMMIFICATION MUNDIFICATION MUNDIFICATIVE MYSTIFICATION NAZIFICATIONS NECTARIFEROUS NEFARIOUSNESS NEUROFEEDBACK NEUROFIBRILAR NEUROFIBROMAS NEWFANGLENESS NIDIFICATIONS NITRIFICATION NITROPARAFFIN NONAFFILIATED NONCLASSIFIED NONCOLOURFAST NONDEFERRABLE NONFIGURATIVE NONFILTERABLE NONFLAMMABLES NONFUNCTIONAL NONMEANINGFUL NONREFILLABLE NONREFUNDABLE NOTIFICATIONS NULLIFICATION OFFHANDEDNESS OMNIFARIOUSLY OSSIFICATIONS OVERFATIGUING OVERFAVOURING OVERINFLATING OVERINFLATION OVERSTAFFINGS PACIFICATIONS PAINFULNESSES PALIFICATIONS PALMIFICATION PANIFICATIONS PARAINFLUENZA PARFOCALISING PARFOCALIZING PASSIONFLOWER PERFECTATIONS PERFECTIONATE PERFOLIATIONS PERSONIFIABLE PETRIFACTIONS PETRIFICATION PLATINIFEROUS PLAYFULNESSES PLEBIFICATION PONTIFICALITY PONTIFICATING PONTIFICATION PONTIFICATORS PORNIFICATION PRAYERFULNESS PREACHIFYINGS PREFIGURATING PREFIGURATION PREFINANCINGS PREFLORATIONS PREFOLIATIONS PREFORMATIONS PREFORMATTING PREQUALIFYING PRESANCTIFIED PRESANCTIFIES PROFANENESSES PROFESSIONALS PROLIFERATING PROLIFERATION PROLIFICATION PROOFREADINGS PURIFICATIONS PUTREFACTIONS PUTRIFICATION QUALIFICATION QUARTERFINALS RAFFISHNESSES RAMIFICATIONS RANGEFINDINGS RAREFACTIONAL RAREFICATIONS RATIFICATIONS REAFFIRMATION REAFFORESTING RECLASSIFYING RECTIFICATION REFASHIONMENT REFERENDARIES REFERENTIALLY REFOCILLATING REFOCILLATION REFORESTATION REFORMATIONAL REFORMULATING REFORMULATION REFOUNDATIONS REFRIGERATING REFRIGERATION REFUNDABILITY REGARDFULNESS REINFESTATION REINFORCEABLE REMANUFACTURE RETRANSFERRED RETRANSFORMED RETRANSFUSING REUNIFICATION SACCHARIFYING SAFECRACKINGS SALIFICATIONS SANCTIFYINGLY SATISFACTIONS SCARIFICATION SCATHEFULNESS SCHADENFREUDE SCORIFICATION SEMIFINALISTS SHAMEFASTNESS SHAPESHIFTING SHRINKFLATION SIGNIFICANCES SIGNIFICANTLY SIGNIFICATION SIGNIFICATIVE SIGNIFICATORS SIGNIFICATORY SLUMPFLATIONS SOLIFIDIANISM SOMNIFACIENTS SOOTHFASTNESS SORBEFACIENTS SPECIFICATING SPECIFICATION SPIFFLICATING SPIFFLICATION SPIFLICATIONS STAMINIFEROUS STANDOFFISHLY STEADFASTNESS STUPEFACIENTS STUPEFACTIONS SUBFEUDATIONS SUBINFEUDATED SUBINFEUDATES SUFFOCATINGLY SUFFRAGANSHIP SUFFUMIGATING SUFFUMIGATION SULFADIAZINES SULFADIMIDINE SULFANILAMIDE SULFONMETHANE SULFONYLUREAS SULFORAPHANES SULFURISATION SULFURIZATION SUPERFETATING SUPERFETATION SUPERFRONTALS SURFBOARDINGS TABLESPOONFUL TACTFULNESSES TARIFFICATION TEARFULNESSES TERRAFORMINGS TESTIFICATION THENCEFORWARD THOUSANDFOLDS THURIFICATION TORREFACTIONS TRANSFECTIONS TRANSFERENCES TRANSFERRABLE TRANSFERRIBLE TRANSFIGURING TRANSFORMABLE TRANSFORMINGS TRANSFORMISMS TRANSFORMISTS TRANSFUSIONAL TRANSFUSIVELY TRIFURCATIONS TRUSTAFARIANS TRYPAFLAVINES TYPIFICATIONS UGLIFICATIONS ULTRAFEMININE UNBEAUTIFULLY UNCOMFORTABLE UNCOMFORTABLY UNCONFORMABLE UNCONFORMABLY UNDERFINANCED UNDERINFLATED UNDERSTAFFING UNDERSURFACES UNENFORCEABLE UNFAILINGNESS UNFALSIFIABLE UNFALTERINGLY UNFAMILIARITY UNFASHIONABLE UNFASHIONABLY UNFATHERLIEST UNFEUDALISING UNFEUDALIZING UNFORESEEABLE UNFORESEEABLY UNFORGETTABLE UNFORGETTABLY UNFORTUNATELY UNFULFILLABLE UNHEALTHFULLY UNINFLAMMABLE UNINFLUENTIAL UNINFORCEABLE UNINFORMATIVE UNJUSTIFIABLE UNJUSTIFIABLY UNPERFORMABLE UNQUALIFIABLE UNQUALIFIEDLY UNREPROACHFUL UNSANCTIFYING UNSATISFIABLE UNSPECIFIABLE UNSTEADFASTLY UNTACTFULNESS UNTHRIFTIHEAD UNTHRIFTYHEAD UNTRANSFORMED UNVITRIFIABLE VERBIFICATION VERIFICATIONS VERSIFICATION VILIFICATIONS VINIFICATIONS VITRIFACTIONS VITRIFICATION VIVIFICATIONS VOCIFERATIONS VOUCHSAFEMENT WAKEFULNESSES WASTERFULNESS WATERFLOODING WATERFOWLINGS WATERPROOFING WINEGLASSFULS WOODCRAFTSMAN WOODCRAFTSMEN YUPPIFICATION ZINCIFICATION ZINKIFICATION ZOMBIFICATION