There are 556 words containing A, F, N and P, https://www.bestwordlist.com/c/a/4/wordswithafnp.htm
AFFENPINSCHER AFFENPINSCHERS AFFRAPPING AFTERPAIN AFTERPAINS
AIRPROOFING AMPLIFICATION AMPLIFICATIONS AMPLIFYING ANTISHOPLIFTING
APRONFUL APRONFULS BABYPROOFING BACKFLIPPING BACKFLIPPINGS CAMPANIFORM
CAPRIFICATION CAPRIFICATIONS CAPRIFYING CHAPFALLEN CHIEFTAINSHIP
CHIEFTAINSHIPS CHOPFALLEN CIPROFLOXACIN CIPROFLOXACINS COMPACTIFYING
COPLAINTIFF COPLAINTIFFS CORPORIFICATION CRAFTMANSHIP CRAFTMANSHIPS
CRAFTSMANSHIP CRAFTSMANSHIPS CRAFTSPERSON CRAFTSPERSONS CYCLOPARAFFIN
CYCLOPARAFFINS DRAFTSMANSHIP DRAFTSMANSHIPS DRAFTSPERSON DRAFTSPERSONS
DRAUGHTPROOFING EPIFAUNA EPIFAUNAE EPIFAUNAL EPIFAUNAS EXEMPLIFICATION
FACEPALMING FACEPLANT FACEPLANTED FACEPLANTING FACEPLANTS FACEPRINT
FACEPRINTS FINGERPLATE FINGERPLATES FINGERPLAY FINGERPLAYS FIREPAN
FIREPANS FIRESCAPING FIRESCAPINGS FISSIPAROUSNESS FLAMEPROOFING
FLANNELGRAPH FLANNELGRAPHS FLAPERON FLAPERONS FLAPPING FLAPPINGS
FLASHPOINT FLASHPOINTS FLATPICKING FLAVOPROTEIN FLAVOPROTEINS
FLAVOPURPURIN FLAVOPURPURINS FLIPPANCIES FLIPPANCY FLIPPANT FLIPPANTLY
FLIPPANTNESS FLIPPANTNESSES FLOATPLANE FLOATPLANES FLOODPLAIN
FLOODPLAINS FLOORPAN FLOORPANS FLUNITRAZEPAM FLUNITRAZEPAMS FLUPHENAZINE
FLUPHENAZINES FOOTPLATEMAN FOOTPLATEMEN FOOTPLATEWOMAN FOOTPLATEWOMEN
FORCIPATION FORCIPATIONS FOREMANSHIP FOREMANSHIPS FOREPAYMENT
FOREPAYMENTS FOREPLAN FOREPLANNED FOREPLANNING FOREPLANS FORESPEAKING
FORETOPMAN FORSPEAKING FORTEPIANIST FORTEPIANISTS FORTEPIANO
FORTEPIANOS FRANCOPHIL FRANCOPHILE FRANCOPHILES FRANCOPHILS FRANCOPHOBE
FRANCOPHOBES FRANCOPHOBIA FRANCOPHOBIAS FRANCOPHONE FRANCOPHONES
FRANGIPANE FRANGIPANES FRANGIPANI FRANGIPANIS FRANGIPANNI FRANKPLEDGE
FRANKPLEDGES FRAPING FRAPPANT FRAPPING FRESHMANSHIP FRESHMANSHIPS
FROGSPAWN FROGSPAWNS FRONTPAGE FRONTPAGED FRONTPAGES FRONTPAGING
FRYPAN FRYPANS GIFTWRAPPING GIFTWRAPPINGS HALFPENCE HALFPENNIES
HALFPENNY HALFPENNYWORTH HALFPENNYWORTHS HASENPFEFFER HASENPFEFFERS
HERPETOFAUNA HERPETOFAUNAE HERPETOFAUNAS HYPERFUNCTIONAL HYPERINFLATED
HYPERINFLATION HYPERINFLATIONS IMPERFORATION IMPERFORATIONS INFOGRAPHIC
INFOGRAPHICS INFOPRENEURIAL INFRALAPSARIAN INFRALAPSARIANS INFRAPOSED
INFRAPOSITION INFRAPOSITIONS INFRASPECIFIC INTRAFALLOPIAN INTRASPECIFIC
KNIPHOFIA KNIPHOFIAS LAPIDIFICATION LAPIDIFICATIONS LAPIDIFYING
LEAPFROGGING LIFEMANSHIP LIFEMANSHIPS LIFESPAN LIFESPANS NAPIFORM
NAUPLIIFORM NITROPARAFFIN NITROPARAFFINS NONPERFORMANCE NONPERFORMANCES
NONPROFESSIONAL NONPROFESSORIAL NONSAPONIFIABLE NONSPECIFICALLY
OPACIFYING OPSONIFICATION OPSONIFICATIONS PACIFICATING PACIFICATION
PACIFICATIONS PACIFYING PACKFONG PACKFONGS PAINFUL PAINFULLER
PAINFULLEST PAINFULLY PAINFULNESS PAINFULNESSES PAKFONG PAKFONGS
PALFRENIER PALFRENIERS PALIFICATION PALIFICATIONS PALMIFICATION
PALMIFICATIONS PANDURIFORM PANFISH PANFISHED PANFISHES PANFISHING
PANFISHINGS PANFORTE PANFORTES PANFRIED PANFRIES PANFRY PANFRYING
PANFUL PANFULS PANIFICATION PANIFICATIONS PANTOFFLE PANTOFFLES
PANTOFLE PANTOFLES PANTOUFLE PANTOUFLES PAPERKNIFE PARAFFIN PARAFFINE
PARAFFINED PARAFFINES PARAFFINIC PARAFFINIER PARAFFINIEST PARAFFINING
PARAFFINOID PARAFFINS PARAFFINY PARAINFLUENZA PARAINFLUENZAS
PARFOCALISING PARFOCALIZING PARTURIFACIENT PARTURIFACIENTS PASSIONFLOWER
PASSIONFLOWERS PATHFINDER PATHFINDERS PATHFINDING PATHFINDINGS
PAYFONE PAYFONES PEACEFULNESS PEACEFULNESSES PENCRAFT PENCRAFTS
PERFECTATION PERFECTATIONS PERFECTIBILIAN PERFECTIBILIANS PERFECTIONATE
PERFECTIONATED PERFECTIONATES PERFECTIONATING PERFLUOROCARBON
PERFOLIATION PERFOLIATIONS PERFORANS PERFORANSES PERFORANT PERFORATING
PERFORATION PERFORATIONS PERFORMANCE PERFORMANCES PERSONIFIABLE
PERSONIFICATION PETRIFACTION PETRIFACTIONS PETRIFICATION PETRIFICATIONS
PIAFFING PIANOFORTE PIANOFORTES PINAFORE PINAFORED PINAFORES
PINFALL PINFALLS PINFEATHER PINFEATHERS PINNATIFID PINNATIFIDLY
PISCIFAUNA PISCIFAUNAE PISCIFAUNAS PLACENTIFORM PLAFOND PLAFONDS
PLAINFUL PLAINTFUL PLAINTIFF PLAINTIFFS PLANFORM PLANFORMS PLANULIFORM
PLATFORMING PLATFORMINGS PLATINIFEROUS PLAYFULNESS PLAYFULNESSES
PLEBIFICATION PLEBIFICATIONS PONTIFICAL PONTIFICALITIES PONTIFICALITY
PONTIFICALLY PONTIFICALS PONTIFICATE PONTIFICATED PONTIFICATES
PONTIFICATING PONTIFICATION PONTIFICATIONS PONTIFICATOR PONTIFICATORS
PORIFERAN PORIFERANS PORNIFICATION PORNIFICATIONS POSTTRANSFUSION
PRANKFUL PRATFALLEN PRATFALLING PRAYERFULNESS PRAYERFULNESSES
PREACHIFYING PREACHIFYINGS PREFABBING PREFABRICATING PREFABRICATION
PREFABRICATIONS PREFACING PREFADING PREFERABLENESS PREFERENTIAL
PREFERENTIALISM PREFERENTIALIST PREFERENTIALITY PREFERENTIALLY
PREFIGURATING PREFIGURATION PREFIGURATIONS PREFINANCE PREFINANCED
PREFINANCES PREFINANCING PREFINANCINGS PREFLORATION PREFLORATIONS
PREFOLIATION PREFOLIATIONS PREFORMATION PREFORMATIONISM PREFORMATIONIST
PREFORMATIONS PREFORMATTING PREFORMULATING PREFRANK PREFRANKED
PREFRANKING PREFRANKS PREFRESHMAN PREFRONTAL PREFRONTALS PREMANUFACTURE
PREMANUFACTURED PREMANUFACTURES PREMODIFICATION PRENOTIFICATION
PREPERFORMANCE PREPERFORMANCES PREPROFESSIONAL PREQUALIFYING
PRESANCTIFIED PRESANCTIFIES PRESANCTIFY PRESANCTIFYING PRETTIFICATION
PRETTIFICATIONS PREUNIFICATION PROFANATION PROFANATIONS PROFANATORY
PROFANE PROFANED PROFANELY PROFANENESS PROFANENESSES PROFANER
PROFANERS PROFANES PROFANING PROFANITIES PROFANITY PROFESSIONAL
PROFESSIONALISE PROFESSIONALISM PROFESSIONALIST PROFESSIONALIZE
PROFESSIONALLY PROFESSIONALS PROFITABLENESS PROLIFERATING PROLIFERATION
PROLIFERATIONS PROLIFICATION PROLIFICATIONS PROOFREADING PROOFREADINGS
PUFFTALOONAS PUFTALOON PUFTALOONAS PUFTALOONIES PUFTALOONS PURIFICATION
PURIFICATIONS PUTREFACIENT PUTREFACTION PUTREFACTIONS PUTRIFICATION
PUTRIFICATIONS RAINPROOF RAINPROOFED RAINPROOFING RAINPROOFS
REPACIFYING REPROACHFULNESS RIFAMPICIN RIFAMPICINS RIFAMPIN RIFAMPINS
SAFEKEEPING SAFEKEEPINGS SAPONIFIABLE SAPONIFICATION SAPONIFICATIONS
SAPONIFIED SAPONIFIER SAPONIFIERS SAPONIFIES SAPONIFY SAPONIFYING
SCARFPIN SCARFPINS SHAPESHIFTING SHAPESHIFTINGS SIMPLIFICATION
SIMPLIFICATIONS SLUMPFLATION SLUMPFLATIONARY SLUMPFLATIONS SPACEFARING
SPACEFARINGS SPAGHETTIFYING SPEARFISHING SPECIFICATING SPECIFICATION
SPECIFICATIONS SPEECHIFICATION SPIFFLICATING SPIFFLICATION SPIFFLICATIONS
SPIFLICATING SPIFLICATION SPIFLICATIONS SPORTFISHERMAN STAINPROOF
STUPEFACIENT STUPEFACIENTS STUPEFACTION STUPEFACTIONS SUBPROFESSIONAL
SUFFRAGANSHIP SUFFRAGANSHIPS SULFINPYRAZONE SULFINPYRAZONES SULFORAPHANE
SULFORAPHANES SUPERFAN SUPERFANS SUPERFETATING SUPERFETATION
SUPERFETATIONS SUPERFICIALNESS SUPERFOETATION SUPERFOETATIONS
SUPERFRONTAL SUPERFRONTALS TABLESPOONFUL TABLESPOONFULS TABLESPOONSFUL
TEASPOONFUL TEASPOONFULS TEASPOONSFUL TEMPERAMENTFUL TEPEFACTION
TEPEFACTIONS TRANSPACIFIC TRIFLUOPERAZINE TRYPAFLAVINE TRYPAFLAVINES
TYMPANIFORM TYPIFICATION TYPIFICATIONS UNAMPLIFIED UNFLAPPABILITY
UNFLAPPABLE UNFLAPPABLENESS UNFLAPPABLY UNFLAPPED UNPACIFIED
UNPAINFUL UNPEACEFUL UNPEACEFULLY UNPERFORATED UNPERFORMABLE
UNPROFANED UNPROFESSIONAL UNPROFESSIONALS UNPROFITABILITY UNPROFITABLE
UNPROFITABLY UNREPROACHFUL UNSPECIFIABLE UNSPECIFICALLY UPFLASHING
UPWAFTING WATERPROOFING WATERPROOFINGS WATERPROOFNESS WEATHERPROOFING
YUPPIFICATION YUPPIFICATIONS