There are 531 twelve-letter words containing A, M, O, P and S, https://www.bestwordlist.com/c/a/5/12letterwordswithamops.htm
ACCOMPANIERS ACCOMPANISTS ACCOMPANYIST ACCOMPLISHED ACCOMPLISHER
ACCOMPLISHES ADIAPHORISMS ADOPTIANISMS ADOPTIONISMS AEROTROPISMS
ALLELOMORPHS ALLOMORPHISM ALLOTROPISMS ALYCOMPAINES AMBIOPHONIES
AMINOPHENOLS AMINOPTERINS AMINOPYRINES AMPELOPSISES AMPHIBIOUSLY
AMPHIBOLITES AMPHICOELOUS AMPHISTOMOUS AMPHITROPOUS AMPULLACEOUS
AMYLOPECTINS AMYOTROPHIES ANAMORPHISMS ANAMORPHOSES ANAMORPHOSIS
ANAPLASMOSES ANAPLASMOSIS ANEMOPHILIES ANEMOPHILOUS ANEMOPHOBIAS
ANGIOSPERMAL ANISOMORPHIC ANISOTROPISM ANTINEPOTISM APOCALYPTISM
APODYTERIUMS APOLITICISMS APOMORPHINES APOSTOLICISM APOTROPAISMS
APPOINTMENTS APPRESSORIUM APPROXIMATES ARCHESPORIUM ARCHOPLASMIC
ARMIPOTENCES ASPERSORIUMS ASTROCOMPASS ASYMPTOMATIC ASYMPTOTICAL
ATMOSPHERICS AUTOMORPHISM AUTOSAMPLERS AZOOSPERMIAS BONDMANSHIPS
BRONCHOSPASM CAMELEOPARDS CAMERAPERSON CAMERAPHONES CAPNOMANCIES
CAPROLACTAMS CASSIOPEIUMS CHAMPIONSHIP CHROMATOPSIA CHROMOPLASTS
CLADOSPORIUM CLEPTOMANIAS COMEUPPANCES COMMONPLACES COMPACTIFIES
COMPAGINATES COMPARATISTS COMPARATIVES COMPARTMENTS COMPASSIONED
COMPEARANCES COMPENSATING COMPENSATION COMPENSATIVE COMPENSATORS
COMPENSATORY COMPILATIONS COMPLACENCES COMPLAINANTS COMPLAININGS
COMPLAISANCE COMPLIANCIES COMPLICACIES COMPORTANCES COMPOTATIONS
COMPRIMARIOS COMPULSATIVE COMPULSATORY COMPURGATORS COMPUTATIONS
COMRADESHIPS CONTEMPLANTS CONTEMPLATES CORPORATISMS CORPOREALISM
COSMOGRAPHER COSMOGRAPHIC COSMOPLASTIC COSMOPOLITAN CRAMPONNINGS
CRYPTOGAMIES CRYPTOGAMIST CRYPTOGAMOUS CRYPTOMERIAS CRYPTOMNESIA
DECOMPENSATE DECOMPOSABLE DEMOGRAPHERS DEMOGRAPHICS DEMOGRAPHIES
DEMOGRAPHIST DEPLUMATIONS DEPROGRAMMES DESPUMATIONS DEUTEROPLASM
DEUTOPLASMIC DIAMORPHINES DIASTROPHISM DIMERCAPROLS DIPLOMATESES
DIPLOMATISED DIPLOMATISES DIPLOMATISTS DIPLOMATIZES DIPSOMANIACS
DROMOPHOBIAS DYNAMOGRAPHS EMANCIPATORS EMETOPHOBIAS EMPASSIONATE
ENCEPHALOMAS ENCOMPASSING EPISCOPALISM EPITHELIOMAS ERGASTOPLASM
ERGATOMORPHS EXOPHTHALMOS EXOPHTHALMUS EXPANSIONISM FOREMANSHIPS
FOREPAYMENTS FORETOPMASTS GAMETOPHORES GAMETOPHYTES GAMOPETALOUS
GAMOPHYLLOUS GAMOSEPALOUS GAMOTROPISMS GRAMOPHONIES GRAMOPHONIST
GRAPHOMANIAS GRAVITROPISM HAEMOPHILIAS HAEMOPHOBIAS HAEMOPOIESES
HAEMOPOIESIS HALOPHYTISMS HAPTOTROPISM HARMONIPHONS HEMERALOPIAS
HEMIANOPSIAS HEMOPHILIACS HIPPODAMISTS HIPPOPOTAMUS HOMEOPATHIES
HOMEOPATHIST HOMOGRAPHIES HOMOPLASMIES HOMOPLASTIES HORSEMANSHIP
HYALOPLASMIC HYLOPATHISMS HYMENOPLASTY HYPERSARCOMA HYPERSOMNIAS
HYPOCORISMAS HYPOGASTRIUM HYPOGNATHISM HYPOKALEMIAS HYPOTHALAMUS
HYPOTHERMIAS IMPARKATIONS IMPARTATIONS IMPASSIONATE IMPASSIONING
IMPASTATIONS IMPERSONALLY IMPERSONATED IMPERSONATES IMPERSONATOR
IMPETRATIONS IMPIGNORATES IMPLICATIONS IMPLORATIONS IMPORTANCIES
IMPORTATIONS IMPOSTHUMATE IMPOSTUMATED IMPOSTUMATES IMPRECATIONS
IMPREGNATORS IMPRESSIONAL IMPRISONABLE IMPROBATIONS IMPROPRIATES
IMPROVISATED IMPROVISATES IMPROVISATOR IMPUGNATIONS IPRATROPIUMS
ISOMETROPIAS KARYOPLASMIC KLEPTOMANIAS KYMOGRAPHIES LAGOMORPHOUS
LAMPOONERIES LAMPROPHYRES LAPAROTOMIES LARYNGOSPASM LEPROSARIUMS
LEPTOSOMATIC LYMPHOBLASTS LYMPHOMATOUS LYMPHOPENIAS MACROPHAGOUS
MACROPHYSICS MACROPTEROUS MADREPORIANS MADREPORITES MAGNETOPAUSE
MAINTOPMASTS MAINTOPSAILS MALAPROPISMS MALAPROPISTS MALLOPHAGOUS
MALPOSITIONS MANCIPATIONS MANIPULATORS MASSOTHERAPY MASTIGOPHORE
MEDIATORSHIP MEGAPROJECTS MELANOPHORES MELLIPHAGOUS MELLOWSPEAKS
MEPROBAMATES MESOCEPHALIC METAMORPHISM METAMORPHIST METAMORPHOSE
METAMORPHOUS METAPHORISTS METAPOLITICS METAPROTEINS MICROAMPERES
MICROCAPSULE MICROCEPHALS MICROPARTIES MICROPHAGOUS MICROPLASTIC
MIMOGRAPHERS MIMOGRAPHIES MISANTHROPES MISANTHROPIC MISANTHROPOS
MISCAPTIONED MISPROGRAMED MONADELPHOUS MONOGRAPHERS MONOGRAPHIES
MONOGRAPHIST MONOPETALOUS MONOSEPALOUS MONOSYNAPTIC MORPHALLAXES
MORPHALLAXIS MORPHOSYNTAX MOUNTAINTOPS MOUSETRAPPED MYCOPHAGISTS
MYCOPLASMATA MYELOPATHIES MYOGRAPHISTS NEMATOPHORES NEOPAGANISMS
NEWSPAPERDOM NOMOGRAPHERS NOMOGRAPHIES NOTAPHILISMS NUCLEOPLASMS
NYMPHOMANIAS OARSMANSHIPS OBTEMPERATES OLIGOSPERMIA OMMATOPHORES
OMNIPARITIES OPERATIONISM OPHIDIARIUMS OPHTHALMISTS OPHTHALMITIS
OPTIMALISING OPTIMALITIES OPTIMISATION OPTIMISTICAL OVEREMPHASES
OVEREMPHASIS OVERPAYMENTS OVERPROGRAMS PACHYDERMOUS PAEDOBAPTISM
PALINDROMIST PAMPELMOOSES PAMPELMOUSES PANDEMONIANS PANDEMONIUMS
PANICMONGERS PANTOMIMISTS PARACETAMOLS PARACHRONISM PARALIMNIONS
PARAMASTOIDS PARAMORPHISM PARAMORPHOUS PARAMOUNCIES PARAPHIMOSES
PARAPHIMOSIS PARASYMBIONT PARKINSONISM PARLOURMAIDS PAROCHIALISM
PARONOMASIAS PARONOMASIES PARONOMASTIC PARONYMOUSLY PAROXYSMALLY
PARSIMONIOUS PASTORALISMS PATHOGNOMIES PEDAGOGUISMS PELARGONIUMS
PERFORMANCES PERGAMENEOUS PERIOSTRACUM PERISTOMATIC PERITONAEUMS
PERMUTATIONS PERSONALISMS PETALOMANIAS PHAENOGAMOUS PHAGOCYTISMS
PHAGOMANIACS PHILOMATHIES PHOTOMOSAICS PHOTOREALISM PHRAGMOPLAST
PHRASEMONGER PHRASEOGRAMS PHYLLOMANIAS PHYTOPLASMAS PICTORIALISM
PIROPLASMATA PLAGIOSTOMES PLANOGAMETES PLANOMETRIES PLASMINOGENS
PLASMODESMAS PLASMOGAMIES PLASMOLYSING PLASMOLYZING PLASMOSOMATA
PLASTOGAMIES PLASTOMETERS PLASTOMETRIC PLATFORMINGS PLEIOCHASIUM
PLOWMANSHIPS PLUMBAGINOUS PLUMULACEOUS PNEUMATHODES PNEUMOGRAPHS
POLARIMETERS POLICYMAKERS POLLYANNAISM POLYAMORISTS POLYGAMISING
POLYGAMOUSLY POLYGONATUMS POLYMASTISMS POLYOMAVIRUS POLYTONALISM
POMEGRANATES PORISMATICAL PORTMANTEAUS POSTIMPERIAL POSTLIMINARY
POSTMEDIEVAL POSTMERIDIAN POSTORGASMIC POSTROMANTIC POSTVAGOTOMY
POTAMOGETONS POTAMOLOGIES POTAMOLOGIST PRASEODYMIUM PREADMISSION
PREDOMINATES PREMENOPAUSE PRENOMINATES PREROMANTICS PRIMULACEOUS
PRISMATOIDAL PROBABILISMS PROBLEMATICS PROCLAIMANTS PROCTODAEUMS
PROGNATHISMS PROGRAMMINGS PROGYMNASIUM PROMPTUARIES PROMULGATORS
PROMUSCIDATE PROPAGANDISM PROPYLAMINES PROSENCHYMAS PROTAGONISMS
PROTOMARTYRS PROTOPLASMAL PROTOPLASMIC PROXIMATIONS PSALMODISING
PSALMODIZING PSAMMOPHILES PSAMMOPHYTES PSAMMOPHYTIC PSEUDIMAGOES
PSEUDOMARTYR PSEUDOMONADS PSEUDORANDOM PSILOMELANES PSYCHODRAMAS
PSYCHOMACHIA PULMOBRANCHS PYRANOMETERS RACTOPAMINES RAMPAGEOUSLY
REASSUMPTION REPROGRAMMES SAPROPHYTISM SARCOPLASMIC SCAPEGOATISM
SCAPULOMANCY SCOPOLAMINES SCYPHISTOMAE SCYPHISTOMAS SEISMOGRAPHS
SEISMOGRAPHY SEMAPHORICAL SEMITROPICAL SHOPAHOLISMS SHOWMANSHIPS
SLUMPFLATION SOMATOPLASMS SOMATOPLEURE SOMATOTROPIC SOMATOTROPIN
SOMATOTYPING SOPHOMORICAL SPASMOLYTICS SPECTROGRAMS SPELAEOTHEMS
SPERMAGONIUM SPERMATOCELE SPERMATOCIDE SPERMATOCYTE SPERMATOGENY
SPERMATOZOAL SPERMATOZOAN SPERMATOZOIC SPERMATOZOID SPERMATOZOON
SPHYGMOGRAMS SPHYGMOGRAPH SPLENOMEGALY SPODOMANCIES SPORANGIOLUM
STAPEDECTOMY STAPHYLOMATA SUBOPTIMALLY SULPHONAMIDE SUPERORGASMS
SUPERSTARDOM SYCOPHANTISM SYMPOSIARCHS SYMPTOMATISE SYMPTOMATIZE
SYNAPOMORPHY SYNAPTOSOMAL SYNAPTOSOMES TAPHONOMISTS TEMPORALISED
TEMPORALISES TEMPORALIZES TEMPORALNESS TEMPORALTIES TEMPORANEOUS
THAUMATROPES THERMOGRAPHS TITIPOUNAMUS TOMOGRAPHIES TRAMPOLINERS
TRAMPOLINIST TRANSUMPTION TROPHOPLASMS TRYPANOSOMAL TRYPANOSOMES
TRYPANOSOMIC TULIPOMANIAS UNCOMPOSABLE VAPORIMETERS WORKMANSHIPS
ZOOSPERMATIC