There are 463 fourteen-letter words containing A, N, 2O and P, https://www.bestwordlist.com/c/a/5/14letterwordswithanoop.htm
ABDOMINOPLASTY ACHONDROPLASIA ACTINOMORPHIES ACTINOMORPHOUS AEROHYDROPLANE
AMINOPHENAZONE ANAMORPHOSCOPE ANDROCEPHALOUS ANDROGYNOPHORE ANISOMETROPIAS
ANTHROPOGENIES ANTHROPOGONIES ANTHROPOGRAPHY ANTHROPOLOGIES ANTHROPOLOGIST
ANTHROPOMETRIC ANTHROPOMORPHS ANTHROPOPATHIC ANTHROPOPHAGIC ANTHROPOPHAGUS
ANTHROPOPHOBIA ANTHROPOPHOBIC ANTHROPOPHUISM ANTHROPOPHYTES ANTHROPOSOPHIC
ANTHROPOTOMIES ANTICORRUPTION ANTIMONOPOLIES ANTIMONOPOLIST ANTIPOLLUTIONS
APOLIPOPROTEIN APOSTROPHISING APOSTROPHIZING APPORTIONMENTS APPRENTICEHOOD
APPROPRIATIONS APPROXIMATIONS ARACHNOPHOBIAS ARACHNOPHOBICS BIPOLARISATION
BIPOLARIZATION BISPHOSPHONATE BLAXPLOITATION BRONCHOSPASTIC CACOPHONICALLY
CAMPANOLOGICAL CAMPANOLOGISTS CANCEROPHOBIAS CEPHALOSPORINS CHLORPROMAZINE
CHOREOGRAPHING CHRONOGRAPHERS CHRONOGRAPHIES CIPROFLOXACINS CLINOPINACOIDS
CLINOPINAKOIDS COCHAIRPERSONS COCONSPIRATORS COLONOGRAPHIES COMPAGINATIONS
COMPANIONHOODS COMPANIONSHIPS COMPASSIONABLE COMPASSIONATED COMPASSIONATES
COMPASSIONLESS COMPENSATIONAL CONCORPORATING CONDUPLICATION CONSCRIPTIONAL
CONSPIRATIONAL CONSPIRATORIAL CONSPURCATIONS CONSTUPRATIONS CONTAINERPORTS
CONTEMPERATION CONTEMPLATIONS CONTEMPORANEAN CONTEMPORARIES CONTEMPORARILY
CONTRACEPTIONS CONTRAPOSITION CONTRAPOSITIVE CONVERTOPLANES COOPERATIONIST
CORPOREALISING CORPOREALIZING COTEMPORANEOUS COTRANSPORTERS COTRANSPORTING
CRANIOSCOPISTS CRYOPROTECTANT CYCLOPENTOLATE CYTOPATHOGENIC DECOMPENSATION
DECOMPOUNDABLE DEPOLARISATION DEPOLARIZATION DISAPPROBATION DISCORPORATING
DISINCORPORATE DODECAPHONISMS DODECAPHONISTS ENANTIOMORPHIC ENANTIOTROPIES
ENDOCRINOPATHY ENDOSCOPICALLY EPIDOTISATIONS EPIDOTIZATIONS EPITOMISATIONS
EPITOMIZATIONS EUTROPHICATION EXPECTORATIONS EXPLORATIONIST EXPONENTIATION
EXPOSTULATIONS EXPROPRIATIONS EXTEMPORANEOUS EXTRAPOLATIONS EXTRAPOSITIONS
FOOTPLATEWOMAN FOOTPLATEWOMEN GALVANOSCOPIES GALVANOTROPISM GEOPOLITICIANS
GERONTOPHILIAS GERONTOPHOBIAS GONADOTROPHINS GYNANDROMORPHS GYNANDROMORPHY
HAPLOSTEMONOUS HOMOPHONICALLY HOMOTRANSPLANT HORRIPILATIONS HYDROPONICALLY
HYPEREMOTIONAL HYPNOTISATIONS HYPNOTIZATIONS HYPOCHONDRIACS HYPOCHONDRIASM
HYPOCHONDRIAST HYPOMENORRHEAS HYPOMENORRHOEA HYPOMIXOLYDIAN HYPOTHECATIONS
ICONOGRAPHICAL IMPERFORATIONS IMPERSONATIONS IMPIGNORATIONS IMPOSTHUMATION
IMPOSTUMATIONS IMPROPRIATIONS IMPROVISATIONS INCORPORATIONS INCORPOREALITY
INDECOMPOSABLE INFRAPOSITIONS INTERCORPORATE INTERPOLATIONS JUXTAPOSITIONS
LARYNGOPHONIES LARYNGOSCOPIES LARYNGOSCOPIST LEUCOCYTOPENIA LEUKOCYTOPENIA
LYMPHOADENOMAS LYOPHILISATION LYOPHILIZATION MACROPINACOIDS MACROPINAKOIDS
MACROSPORANGIA MALABSORPTIONS MALAPPORTIONED MASTIGOPHORANS MEGALOPOLITANS
METAMORPHOSING MICROPLANKTONS MICROPULSATION MICROSPORANGIA MICROSPORIDIAN
MISANTHROPOSES MISCOMPUTATION MONOCARPELLARY MONOPHONICALLY MONOPHOSPHATES
MONOPOLISATION MONOPOLIZATION MONOPRIONIDIAN MONOPROPELLANT MORPHINOMANIAC
MORPHINOMANIAS MORPHOSYNTAXES NANNOPLANKTONS NANOCOMPOSITES NEPHROBLASTOMA
NEUROPATHOLOGY NONCOMPLIANCES NONCOMPLICATED NONCOOPERATION NONCOOPERATIVE
NONCOOPERATORS NONEXPLANATORY NONIMPLICATION NONIMPORTATION NONOPERATIONAL
NONOVERLAPPING NONPERFORMANCE NONPOLARISABLE NONPOLARIZABLE NONPOLITICALLY
NONPOLITICIANS NONPROGRAMMERS NONPROPRIETARY NONRECIPROCALS NONTEMPORALITY
OCCUPATIONALLY OCEANOGRAPHERS OCEANOGRAPHIES ODONTOGRAPHIES OMPHALOMANCIES
ONOMATOPOIESES ONOMATOPOIESIS ONYCHOPHAGISTS OPERATIONALISM OPERATIONALIST
OPINIONATIVELY OPISTHOBRANCHS OPISTHOCOELIAN OPPIGNERATIONS OPPIGNORATIONS
OPSONIFICATION OPTIMALISATION OPTIMALIZATION ORGANOGRAPHIES ORGANOGRAPHIST
ORNITHOPHOBIAS ORTHOPINAKOIDS OVERCOMPENSATE OVERCOMPLIANCE OVEREXPANSIONS
OVERPERSUASION OVERPOPULATING OVERPOPULATION OVERPROGRAMING PALAEETHNOLOGY
PALAEOBOTANIES PALAEOBOTANIST PALEOBOTANICAL PALEOBOTANISTS PALEONTOLOGIES
PALEONTOLOGIST PANHARMONICONS PANIDIOMORPHIC PANTALOONERIES PANTHEOLOGISTS
PAPILIONACEOUS PARABOLISATION PARABOLIZATION PARALEIPOMENON PARONOMASTICAL
PARSIMONIOUSLY PARTHENOSPORES PASSIONFLOWERS PATRONISATIONS PATRONIZATIONS
PENTOBARBITONE PEPTONISATIONS PEPTONIZATIONS PERINATOLOGIES PERINATOLOGIST
PERIODISATIONS PERIODIZATIONS PERLOCUTIONARY PHARMACOPOEIAN PHARYNGOLOGIES
PHARYNGOLOGIST PHARYNGOSCOPES PHARYNGOSCOPIC PHARYNGOTOMIES PHENOBARBITONE
PHENOLOGICALLY PHILANTHROPOID PHONAUTOGRAPHS PHONETISATIONS PHONETIZATIONS
PHONOGRAPHISTS PHONOLOGICALLY PHOSPHOCREATIN PHOSPHOKINASES PHOTOENGRAVERS
PHOTOENGRAVING PHOTOGENICALLY PHOTOOXIDATION PHOTOREACTIONS PHOTOSYNTHATES
PHYSIOGNOMICAL PHYTOPATHOGENS PHYTOPLANKTONS PLACENTOLOGIES PLANETOLOGICAL
PLANETOLOGISTS PLASTOQUINONES PLECTOGNATHOUS PNEUMATOLOGIES PNEUMATOLOGIST
PNEUMATOPHORES PNEUMOTHORACES PNEUMOTHORAXES POCOCURANTEISM POCOCURANTISMS
POCOCURANTISTS PODSOLISATIONS PODSOLIZATIONS PODZOLISATIONS PODZOLIZATIONS
POLEMONIACEOUS POLITICISATION POLITICIZATION POLLICITATIONS POLYCARBONATES
POLYDAEMONISMS POLYEMBRYONATE POLYHISTORIANS POLYMERISATION POLYMERIZATION
POLYNOMIALISMS POLYPHONICALLY POLYTONALITIES PONTIFICATIONS POPULARISATION
POPULARIZATION PORNIFICATIONS POSSESSIONATES POSTADOLESCENT POSTAMPUTATION
POSTERISATIONS POSTERIZATIONS POSTGANGLIONIC POSTGRADUATION POSTLIBERATION
POSTMENOPAUSAL POSTPOSITIONAL PREADMONITIONS PRECONISATIONS PRECONIZATIONS
PRECONSONANTAL PREDOMINATIONS PRENEGOTIATION PRENOMINATIONS PREOCCUPATIONS
PREOPERATIONAL PREORDINATIONS PREPONDERATION PRIORITISATION PRIORITIZATION
PROBATIONARIES PROCESSIONALLY PROCRASTINATOR PROFESSIONALLY PROGESTATIONAL
PROGNOSTICATED PROGNOSTICATES PROGNOSTICATOR PROGRESSIONARY PROHIBITIONARY
PROJECTISATION PROJECTIZATION PROLIFERATIONS PROLIFICATIONS PRONOMINALISED
PRONOMINALISES PRONOMINALIZED PRONOMINALIZES PRONUNCIAMENTO PRONUNCIATIONS
PROPAROXYTONES PROPERISPOMENA PROPORTIONABLE PROPORTIONABLY PROPORTIONALLY
PROPORTIONATED PROPORTIONATES PROSENCEPHALON PROSOPAGNOSIAS PROSTHODONTIAS
PROTHONOTARIAL PROTHONOTARIAT PROTHONOTARIES PROTOACTINIUMS PROTOHISTORIAN
PROTOLANGUAGES PROTONOTARIATS PROTOPLANETARY PROTUBERATIONS PROVISIONARIES
RADIOTELEPHONE RADIOTELEPHONY REAPPORTIONING RECIPROCATIONS RECOMPILATIONS
RECOMPUTATIONS REEXPLORATIONS REEXPORTATIONS REIMPORTATIONS REINCORPORATED
REINCORPORATES REPOLARISATION REPOLARIZATION REPROBATIONARY ROENTGENOGRAPH
ROENTGENOPAQUE RONTGENOGRAPHS RONTGENOGRAPHY SAPONIFICATION SEXPLOITATIONS
SHARPSHOOTINGS SINDONOPHANIES SOMATOTROPHINS SOMATOTROPINES SOPHISTICATION
SPERMATOGENOUS SPERMATOGONIAL SPERMATOGONIUM SPHAGNOLOGISTS SPIRONOLACTONE
SPONGIOBLASTIC SPORANGIOPHORE SPORANGIOSPORE SUBPOPULATIONS SUBSPONTANEOUS
SUPEREROGATION SUPERFOETATION SUPEROVULATION SUPPOSITIONARY SYNAPOMORPHIES
TABLESPOONFULS TABLESPOONSFUL TECHNOPOLITANS TELEPORTATIONS TEMPORISATIONS
TEMPORIZATIONS TENDONOPATHIES THANATOPHOBIAS THROMBOPLASTIN THYSANOPTEROUS
TOTIPALMATIONS TRANSPORTATION TRANSPOSITIONS TRAPEZOHEDRONS TREPONEMATOSES
TREPONEMATOSIS TROPOCOLLAGENS UNCONTEMPORARY UNDECOMPOSABLE UNINCORPORATED
UNPROFESSIONAL UPROARIOUSNESS VAPOROUSNESSES WATERPROOFINGS WATERPROOFNESS
WEAPONIZATIONS XANTHOPHYLLOUS XENOPHOBICALLY