There are 501 twelve-letter words containing A, F and 2I, https://www.bestwordlist.com/c/a/4/12letterwordswithafii.htm
ACRIFLAVINES AERIFICATION AFFABILITIES AFFECTIONING AFFICIONADOS
AFFILIATIONS AFFIRMATIONS AFFIRMATIVES AFFLICTIVELY AFFRICATIONS
AFFRICATIVES AIRFREIGHTED ANGUILLIFORM ANTIAIRCRAFT ANTIFASCISMS
ANTIFASCISTS ANTIFASHIONS ANTIFEBRILES ANTIFEMININE ANTIFEMINISM
ANTIFEMINIST ANTIFOULINGS ANTIFRICTION ARTIFICIALLY BACKFILLINGS
BACKFITTINGS BACKFLIPPING BAILIFFSHIPS BASIFICATION BEATIFICALLY
BENEFICIALLY BENEFICIATED BENEFICIATES BIFUNCTIONAL BIFURCATIONS
BIOFLAVONOID CAFFEINATING CALIFORNIUMS CAULIFLORIES CERTIFICATED
CERTIFICATES CHIEFTAINESS CITIFICATION CITYFICATION CLASSIFIABLE
CLIFFHANGING CODIFICATION COMPACTIFIED COMPACTIFIES CONFIDENTIAL
CONFIRMATION CONFIRMATIVE CONFISCATING CONFISCATION COPLAINTIFFS
CRANIOFACIAL CURVIFOLIATE DAFFODILLIES DEACIDIFYING DECALCIFIERS
DECALCIFYING DECLASSIFIED DECLASSIFIES DECRASSIFIED DECRASSIFIES
DEFIBRILLATE DEFIBRINATED DEFIBRINATES DEFILIATIONS DEFINABILITY
DEFINITIONAL DEFLATIONIST DEFOLIATIONS DEFORCIATION DEIFICATIONS
DESANCTIFIED DESANCTIFIES DIFFERENTIAE DIFFERENTIAL DIFFRACTIONS
DIFFRANGIBLE DIFUNCTIONAL DISAFFECTING DISAFFECTION DISAFFILIATE
DISAFFIRMING DISDAINFULLY DISFAVOURING DISFEATURING DISFRANCHISE
DISINFECTANT DISINFESTANT DISINFLATION DISQUALIFIED DISQUALIFIER
DISQUALIFIES DISSATISFIED DISSATISFIES DISSYLLABIFY EDIFICATIONS
EFFEMINACIES EFFEMINATING EFFICACITIES EFFIGURATION EMULSIFIABLE
EXFILTRATING EXFILTRATION EXFOLIATIONS FABRICATIONS FABULOSITIES
FACILITATING FACILITATION FACILITATIVE FACILITATORS FACILITATORY
FACSIMILEING FACSIMILISTS FACTIONALISE FACTIONALISM FACTIONALIST
FACTIONALIZE FACTIONARIES FACTITIOUSLY FACTUALISTIC FACTUALITIES
FAINEANTISES FAINTISHNESS FAIRNITICKLE FAIRNITICLES FAIRNYTICKLE
FAIRNYTICLES FALDISTORIES FALLIBILISMS FALLIBILISTS FAMILIARISED
FAMILIARISER FAMILIARISES FAMILIARIZED FAMILIARIZER FAMILIARIZES
FAMILIARNESS FANATICISING FANATICIZING FANTASTICISM FARADISATION
FARADIZATION FASCINATIONS FASCIOLIASES FASCIOLIASIS FASHIONISTAS
FASTIDIOUSLY FATIGABILITY FAULTFINDING FAVORABILITY FAVOURITISMS
FEBRIFACIENT FEDERALISING FEDERALISTIC FEDERALIZING FELICITATING
FELICITATION FELICITATORS FEMINALITIES FEMINISATION FEMINIZATION
FERRICYANIDE FERTIGATIONS FERTILISABLE FERTILIZABLE FESTINATIONS
FIBERISATION FIBERIZATION FIBRILLATING FIBRILLATION FIBROBLASTIC
FIBROMYALGIA FICTIONALISE FICTIONALITY FICTIONALIZE FIGURABILITY
FIGURATIVELY FILIALNESSES FILLAGREEING FILTRABILITY FIMBRIATIONS
FINALISATION FINALIZATION FINANCIALIST FINANCIERING FINASTERIDES
FINICALITIES FIRESCAPINGS FISSICOSTATE FISSILINGUAL FISSIONABLES
FISSIPALMATE FISSIPARISMS FISSIROSTRAL FLACCIDITIES FLAGITATIONS
FLAGITIOUSLY FLAMMABILITY FLAVIVIRUSES FLEXITARIANS FLICKERTAILS
FLIMFLAMMING FLOATABILITY FLUIDISATION FLUIDIZATION FLUORIDATING
FLUORIDATION FLUORINATING FLUORINATION FLUVIOMARINE FOCALISATION
FOCALIZATION FONTINALISES FORAMINIFERA FORAMINIFERS FORCIPATIONS
FORGEABILITY FORMICATIONS FORNICATIONS FORTEPIANIST FOSSILISABLE
FOSSILIZABLE FRACTALITIES FRACTIONISED FRACTIONISES FRACTIONIZED
FRACTIONIZES FRANCISATION FRANCIZATION FRANGIBILITY FRANKLINITES
FRATERNISING FRATERNITIES FRATERNIZING FRIABILITIES FRICASSEEING
FRICTIONALLY FRITILLARIAS FRITILLARIES FRONTALITIES FULMINATIONS
FUNDRAISINGS FUNGICIDALLY FUSILLATIONS FUSTIANISING FUSTIANIZING
FUSTIGATIONS FUSTILARIANS FUSTILIRIANS FUSTILLIRIAN FUTILITARIAN
GAMIFICATION GASIFICATION GIFTWRAPPING GRATIFYINGLY GUITARFISHES
HIGHFALUTING HIGHFALUTINS HORRIFICALLY HUMIFICATION HYDATIDIFORM
IDENTIFIABLE IDENTIFIABLY INARTIFICIAL INDEFEASIBLE INDEFEASIBLY
INDEFINABLES INEFFABILITY INEFFICACIES INEFFICACITY INFAMONISING
INFAMONIZING INFANGTHIEFS INFANTICIDAL INFANTICIDES INFANTILISED
INFANTILISES INFANTILISMS INFANTILIZED INFANTILIZES INFATUATIONS
INFESTATIONS INFEUDATIONS INFIBULATING INFIBULATION INFILTRATING
INFILTRATION INFILTRATIVE INFILTRATORS INFINITATING INFIRMARIANS
INFLAMMATION INFLATIONARY INFLATIONISM INFLATIONIST INFLECTIONAL
INFLUENTIALS INFOGRAPHICS INFOMERCIALS INFORMATIONS INFORMATISED
INFORMATISES INFORMATIZED INFORMATIZES INFORMIDABLE INFOTAINMENT
INFRAORBITAL INFUNDIBULAR INFURIATIONS INGRAFTATION INSUFFLATING
INSUFFLATION INTERFACINGS INTERFLUVIAL INTERFOLIATE INTERTRAFFIC
JUSTIFICATOR LANDFILLINGS LATICIFEROUS LATIFUNDIUMS LIFEGUARDING
LIFEMANSHIPS LIGULIFLORAL LIQUEFACIENT LIQUEFACTION LIQUEFACTIVE
LIQUIFACTION LIQUIFACTIVE MAGNIFICALLY MAGNIFICENCE MAMMILLIFORM
MANIFESTIBLE MANIFESTOING METAFICTIONS MICROFILARIA MICROFINANCE
MINIFICATION MISFEATURING MISFORMATION MISINFORMANT MODIFICATION
MODIFICATIVE MODIFICATORY MORBIFICALLY MULTIFARIOUS MULTIFOLIATE
MYOFIBRILLAR NAZIFICATION NIDIFICATING NIDIFICATION NONFICTIONAL
NONFINANCIAL NONOFFICIALS NOTIFICATION NULLIFIDIANS OFFICIALDOMS
OFFICIALESES OFFICIALISMS OFFICIALTIES OFFICIATIONS OSSIFICATION
OVERFAMILIAR PACIFICATING PACIFICATION PACIFICATORS PACIFICATORY
PALIFICATION PANIFICATION PARAFFINIEST PARVIFOLIATE PATHFINDINGS
PERFOLIATION PETRIFACTION PETRIFACTIVE PINNATIFIDLY PONTIFICALLY
PONTIFICATED PONTIFICATES PONTIFICATOR PREACHIFYING PREAMPLIFIER
PREFINANCING PREFOLIATION PREQUALIFIED PREQUALIFIES PROFLIGACIES
PROLIFICALLY PURIFICATION PURIFICATIVE PURIFICATORS PURIFICATORY
QUALIFICATOR QUANTIFIABLE RABBITFISHES RAINPROOFING RAMIFICATION
RANGEFINDING RANKSHIFTING RAREFICATION RATIFICATION RECLASSIFIED
RECLASSIFIES REFASHIONING REFINANCINGS REFRACTIVITY REFUTABILITY
REIFICATIONS REINFLATIONS REQUALIFYING RIBOFLAVINES RIFACIMENTOS
SACCHARIFIED SACCHARIFIES SALIFICATION SALVIFICALLY SANCTIFIABLE
SANCTIFIEDLY SANCTIFYINGS SAPONIFIABLE SATISFACTION SATISFICINGS
SATISFYINGLY SCARIFICATOR SCARIFYINGLY SCIENTIFICAL SEMIFINALIST
SEMIOFFICIAL SIGNIFICANCE SIGNIFICANCY SIGNIFICANTS SIGNIFICATES
SIGNIFICATOR SIMPLIFIABLE SINFONIETTAS SMIFLIGATING SOLIDIFIABLE
SOMNIFACIENT SPEARFISHING SPECIFICALLY SPECIFICATED SPECIFICATES
SPIFFLICATED SPIFFLICATES SPIFLICATING SPIFLICATION STEPFAMILIES
SUFFIXATIONS SULFADIAZINE SUPERFICIALS SYLLABIFYING TERRIFICALLY
TESTIFICATES TESTIFICATOR TIBIOFIBULAE TIBIOFIBULAS TITANIFEROUS
TRAFFICKIEST TRAFFICKINGS TRANSFIXIONS TRANSPACIFIC TRIFLURALINS
TRIFOLIOLATE TRIFURCATING TRIFURCATION TRINACRIFORM TYPIFICATION
UGLIFICATION UNAFFILIATED UNARTIFICIAL UNBENEFICIAL UNCLASSIFIED
UNFAMILIARLY UNFASTIDIOUS UNIFICATIONS UNIFOLIOLATE UNMODIFIABLE
UNOFFICIALLY UNQUALIFYING UNQUANTIFIED UNSANCTIFIED UNSANCTIFIES
UNSATISFYING UNSTRATIFIED UNVERIFIABLE UNVERIFIABLY VERIFICATION
VERIFICATIVE VERIFICATORY VERSIFICATOR VILIFICATION VINIFICATION
VINIFICATORS VITRIFACTION VITRIFACTURE VIVIFICATION VOCIFERATING
VOCIFERATION