There are 451 fourteen-letter words containing A, F, I and T, https://www.bestwordlist.com/c/a/4/14letterwordswithafit.htm
ABORTIFACIENTS ABSORBEFACIENT ACETIFICATIONS ACIDIFICATIONS AFFECTIONATELY
AFFORESTATIONS AFFREIGHTMENTS AFOREMENTIONED AFTERSENSATION AGRIFOODSTUFFS
AGROFORESTRIES AIRCRAFTSWOMAN AIRCRAFTSWOMEN AMMONIFICATION AMPLIFICATIONS
ANGUSTIFOLIATE ANTIDEFAMATION ANTIFEDERALIST ANTIFILIBUSTER ANTIFOREIGNERS
ANTIFORMALISMS ANTIFORMALISTS ANTIREFLECTION ANTIREFLECTIVE ANTISCIENTIFIC
ARTIFICIALISED ARTIFICIALISES ARTIFICIALIZED ARTIFICIALIZES ARTIFICIALNESS
AUTOINFECTIONS BEATIFICATIONS BEAUTIFICATION BENEFICIATIONS BIOINFORMATICS
BREASTFEEDINGS CALCIFICATIONS CALORIFICATION CAPRIFICATIONS CARNIFICATIONS
CAULIFLOWERETS CENTRIFUGALISE CENTRIFUGALIZE CENTRIFUGATION CERTIFICATIONS
CHIEFTAINESSES CHIEFTAINSHIPS CHYLIFICATIONS CHYMIFICATIONS CLARIFICATIONS
CLASSIFICATION CLASSIFICATORY COALIFICATIONS COCKNIFICATION CONFABULATIONS
CONFARREATIONS CONFEDERATIONS CONFIDENTIALLY CONFIGURATIONS CONFIRMABILITY
CONFIRMATIONAL CONFLAGRATIONS CONFORMABILITY CONFORMATIONAL CONFRONTATIONS
CORNIFICATIONS COTRANSFERRING CRAFTSMANSHIPS DAMNIFICATIONS DANDIFICATIONS
DECAFFEINATING DEFEMINISATION DEFEMINIZATION DEFENESTRATING DEFENESTRATION
DEFIBRILLATING DEFIBRILLATION DEFIBRILLATORS DEFIBRINATIONS DEFINABILITIES
DEFLAGRABILITY DEFLOCCULATING DEFLOCCULATION DEFORESTATIONS DELIRIFACIENTS
DENAZIFICATION DENITRIFICATOR DENSIFICATIONS DESULFURATIONS DETOXIFICATION
DIAMANTIFEROUS DIFFARREATIONS DIFFERENTIABLE DIFFERENTIALLY DIFFERENTIATED
DIFFERENTIATES DIFFERENTIATOR DIFFRACTOMETER DIFFRACTOMETRY DIGNIFICATIONS
DINOFLAGELLATE DISAFFILIATING DISAFFILIATION DISAFFIRMATION DISAFFORESTING
DISCOMFORTABLE DISFEATUREMENT DISFIGURATIONS DISFORESTATION DISINFESTATION
DISINFORMATION DISSATISFIEDLY DRAFTSMANSHIPS DULCIFICATIONS EBURNIFICATION
EFFECTUALITIES EFFEMINATENESS EMULSIFICATION ENFORCEABILITY ESTERIFICATION
ETHERIFICATION FACTIONALISING FACTIONALIZING FACTIOUSNESSES FACTITIOUSNESS
FACTORISATIONS FACTORIZATIONS FAINTHEARTEDLY FAINTISHNESSES FAITHFULNESSES
FAITHWORTHIEST FALSIFIABILITY FALSIFICATIONS FANATICISATION FANATICIZATION
FANTASTICALITY FANTASTICATING FANTASTICATION FARSIGHTEDNESS FARTHINGSWORTH
FASCICULATIONS FASHIONABILITY FASTIDIOUSNESS FATALISTICALLY FATHERLINESSES
FATIGABILITIES FATIGUABLENESS FAVORABILITIES FEATHERBEDDING FEATHERBRAINED
FEATHERINESSES FEATHERWEIGHTS FEDERALISATION FEDERALIZATION FERMENTABILITY
FERMENTATIVELY FERRIMAGNETISM FERROMAGNETISM FERROPRUSSIATE FERTILISATIONS
FERTILIZATIONS FETISHISATIONS FETISHIZATIONS FEUDALISATIONS FEUDALIZATIONS
FIBROCARTILAGE FIBROSARCOMATA FICTIONALISING FICTIONALITIES FICTIONALIZING
FICTIONISATION FICTIONIZATION FIGURABILITIES FIGURATIVENESS FILTERABLENESS
FILTRABILITIES FINGERBREADTHS FISSIONABILITY FLABBERGASTING FLAGELLANTISMS
FLAGITIOUSNESS FLAMMABILITIES FLEXITARIANISM FLIPPANTNESSES FLOATABILITIES
FLOCCILLATIONS FLUNITRAZEPAMS FONCTIONNAIRES FOREORDAINMENT FOREORDINATION
FORESEEABILITY FORGEABILITIES FORISFAMILIATE FORMALISATIONS FORMALIZATIONS
FORNICATRESSES FORTIFICATIONS FOSSILISATIONS FOSSILIZATIONS FOUNDATIONALLY
FOUNDATIONLESS FRACTIONALISED FRACTIONALISES FRACTIONALISMS FRACTIONALISTS
FRACTIONALIZED FRACTIONALIZES FRACTIONATIONS FRACTOGRAPHIES FRAGMENTATIONS
FRANCHISEMENTS FRANGIBILITIES FRATERNISATION FRATERNIZATION FREQUENTATIONS
FREQUENTATIVES FRONTIERSWOMAN FRUCTIFICATION FRUITARIANISMS FUNAMBULATIONS
FUNCTIONALISMS FUNCTIONALISTS FUNDAMENTALISM FUNDAMENTALIST FUNDAMENTALITY
FUTURISTICALLY GEMEINSCHAFTEN GENTRIFICATION GLORIFICATIONS GRANDFATHERING
GRATIFICATIONS HALFWITTEDNESS HANDICRAFTSMAN HANDICRAFTSMEN HORRIFICATIONS
HUMIDIFICATION HYPERINFLATION IDENTIFICATION IMPERFORATIONS INARTIFICIALLY
INDEFINABILITY INEFFABILITIES INEFFECTUALITY INEFFICACITIES INFALLIBILISTS
INFINITESIMALS INFLAMMABILITY INFLAMMATORILY INFLATEDNESSES INFLECTIONALLY
INFORMATICIANS INFRANGIBILITY INFRAPOSITIONS INFRASTRUCTURE INTERFERENTIAL
INTERFEROGRAMS INTERFOLIATING INTRAFALLOPIAN IRREFUTABILITY JELLIFICATIONS
JOLLIFICATIONS JUSTIFIABILITY JUSTIFICATIONS KARSTIFICATION LABEFACTATIONS
LAPIDIFICATION LIGNIFICATIONS LIGNOSULFONATE LITHIFICATIONS MAGNIFICATIONS
MALFUNCTIONING MANIFESTATIONS MANIFESTNESSES MANUFACTURINGS MASSIFICATIONS
MATRESFAMILIAS MELLIFICATIONS METAFICTIONIST METRIFICATIONS MICROFILAMENTS
MISINFORMATION MOLLIFICATIONS MORTIFICATIONS MULTIFACTORIAL MULTIFARIOUSLY
MULTIFILAMENTS MULTIFOLIOLATE MUMMIFICATIONS MUNDIFICATIONS MUNDIFICATIVES
MYSTIFICATIONS NEUROFIBROMATA NITRIFICATIONS NITROPARAFFINS NONFICTIONALLY
NONFILAMENTOUS NONFORFEITABLE NONINFORMATION NONSIGNIFICANT NULLIFICATIONS
OLFACTOLOGISTS OLFACTOMETRIES OPSONIFICATION OUTFANGTHIEVES OVERFASTIDIOUS
OVERINFLATIONS PACIFISTICALLY PALMIFICATIONS PARTURIFACIENT PATRESFAMILIAS
PERFECTABILITY PERFECTIBILIAN PERFECTIONATED PERFECTIONATES PERFORMABILITY
PERFORMATIVELY PETRIFICATIONS PLEBIFICATIONS PONTIFICATIONS PORNIFICATIONS
PREFABRICATING PREFABRICATION PREFABRICATORS PREFERENTIALLY PREFIGURATIONS
PREFORMULATING PRESANCTIFYING PRETTIFICATION PREUNIFICATION PROFESSORIATES
PROFITABLENESS PROLIFERATIONS PROLIFICATIONS PUTRIFICATIONS QUALIFICATIONS
QUALIFICATIVES QUANTIFICATION QUATREFEUILLES QUINQUEFOLIATE QUIZZIFICATION
RAREFICATIONAL REAFFIRMATIONS RECODIFICATION RECONFIRMATION RECTIFIABILITY
RECTIFICATIONS REFASHIONMENTS REFERENTIALITY REFOCILLATIONS REFORESTATIONS
REFORMATIONIST REFORMULATIONS REFRACTIVENESS REFRACTIVITIES REFRACTOMETRIC
REFRACTORINESS REFRANGIBILITY REFRIGERATIONS REFUTABILITIES REINFESTATIONS
RESINIFICATION RETRANSFERRING RETRANSFORMING REUNIFICATIONS REVIVIFICATION
RIGIDIFICATION SANCTIFICATION SANGUIFICATION SAPONIFICATION SATISFACTORILY
SCARIFICATIONS SCIENTIFICALLY SCORIFICATIONS SHAPESHIFTINGS SHRINKFLATIONS
SIGNIFICATIONS SILICIFICATION SIMPLIFICATION SIMPLIFICATIVE SIMPLIFICATORS
SOLIDIFICATION SPAGHETTIFYING SPECIFICATIONS SPIFFLICATIONS SPORTFISHERMAN
STAGFLATIONARY STALACTITIFORM STIGMATIFEROUS STRATIFICATION STULTIFICATION
SUBINFEUDATING SUBINFEUDATION SUBINFEUDATORY SUFFRAGETTISMS SUFFUMIGATIONS
SULFACETAMIDES SULFAMETHAZINE SULFATHIAZOLES SULFURISATIONS SULFURIZATIONS
SUPERFETATIONS SUPERFICIALITY SUPERFOETATION TARIFFICATIONS TELEFACSIMILES
TESTIFICATIONS TETRAFLUORIDES THURIFICATIONS TRAFFICABILITY TRANSFERENTIAL
TRANSFORMATION TRANSFORMATIVE TRANSFORMISTIC TRANSFUSIONIST TRANSMOGRIFIED
TRANSMOGRIFIES ULTRAEFFICIENT ULTRAFILTERING ULTRAFILTRATES UNAFFECTIONATE
UNARTIFICIALLY UNCERTIFICATED UNDERINFLATION UNDERSTAFFINGS UNFAITHFULNESS
UNFLAPPABILITY UNFLATTERINGLY UNFRACTIONATED UNIDENTIFIABLE UNIDENTIFIABLY
UNIFORMITARIAN UNQUANTIFIABLE UNQUANTIFIABLY UNREFRIGERATED UNSATISFACTION
UNSATISFACTORY UNTHRIFTIHEADS UNTHRIFTYHEADS USUFRUCTUARIES VERBIFICATIONS
VERSIFICATIONS VIBROFLOTATION VITRIFIABILITY VITRIFICATIONS WATERFLOODINGS
WATERPROOFINGS YUPPIFICATIONS ZINCIFICATIONS ZINCKIFICATION ZINKIFICATIONS
ZOMBIFICATIONS