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