There are 855 nine-letter words containing A, M and 2S, https://www.bestwordlist.com/c/a/4/9letterwordswithamss.htm
ABELMOSKS ABSURDISM ACCUSTOMS ACOSMISMS ACOSMISTS ACROSOMES ACROTISMS
ACTINISMS ACTIVISMS ADAMSITES ADMISSION ADMISSIVE AIMLESSLY ALARMISMS
ALARMISTS ALASTRIMS ALBINISMS ALBUMOSES ALGORISMS ALIENISMS ALLELISMS
ALMAGESTS ALMSHOUSE ALPINISMS ALTISSIMO ALTRUISMS AMASSABLE AMASSMENT
AMAUROSES AMAUROSIS AMBASSAGE AMBASSIES AMBROSIAS AMBUSHERS AMEBIASES
AMEBIASIS AMETHYSTS AMIDSHIPS AMISSIBLE AMNESIACS AMNESTIES AMORTISES
AMPASSIES AMPLENESS AMUSETTES ANAMNESES ANAMNESIS ANEURISMS ANEURYSMS
ANGSTROMS ANTIMASKS APHORISMS APTERISMS ARCHAISMS ARMORISTS ARMORLESS
ASPERMIAS ASSEMBLED ASSEMBLER ASSEMBLES ASSUMABLE ASSUMABLY ASSUMEDLY
ASSUMINGS ASSUMPSIT ASTERISMS ASTIGMIAS ATAMASCOS ATMOLYSES ATMOLYSIS
ATOMISERS ATROPISMS ATTICISMS AUTECISMS AUTOSOMES AXOPLASMS BABELISMS
BADMASHES BALMINESS BARMINESS BASEMENTS BASHAWISM BASHMENTS BATHMISMS
BEAMINESS BETACISMS BIGAMISTS BIMBASHIS BINARISMS BIOMASSES BIOPLASMS
BISMARCKS BLAMELESS BLASTEMAS BLASTOMAS BOYARISMS BUDMASHES BUSHMEATS
CABALISMS CAESARISM CAFFEISMS CALAMUSES CAMBOOSES CAMISADES CAMISADOS
CAMISOLES CAMPINESS CAMPSITES CAMSHAFTS CAMSTANES CAMSTONES CAPSICUMS
CAPSOMERS CASCHROMS CASEMATES CASEMENTS CASEMIXES CASEWORMS CASHMERES
CASIMERES CASIMIRES CASSIMERE CASTEISMS CASUALISM CATHISMAS CERAMISTS
CHAMISALS CHAMOISES CHARISMAS CHARMLESS CHARTISMS CHASMIEST CHILIASMS
CHLAMYSES CHLOASMAS CHRISMALS CHUMASHES CLASSISMS CLASSMATE CLASSROOM
COASSUMED COASSUMES COMMISSAR COMPASSED COMPASSES COPROSMAS COSEISMAL
CRAMESIES CROSSARMS CROSSBEAM CUSTUMALS DAMASKINS DAMASSINS DAMNDESTS
DAMOISELS DANDYISMS DEMITASSE DESTREAMS DIASTEMAS DIGAMISTS DISABLISM
DISARMERS DISCLAIMS DISMALEST DISMASKED DISMASTED DISMISSAL DOMESDAYS
DONATISMS DOOMSDAYS DRAMSHOPS DREAMLESS DRESSMADE DRESSMAKE DWARFISMS
DYNAMISES DYNAMISMS DYNAMISTS DYSMELIAS EASEMENTS EGGMASSES EMBARRASS
EMBASSADE EMBASSAGE EMBASSIES EMBRASORS EMPHASISE ENCOMPASS ENSAMPLES
ESCAPISMS ESEMPLASY ESTIMATES ETATISMES EXOPLASMS FABULISMS FACEMASKS
FAIRYISMS FAKIRISMS FAMILISMS FARADISMS FARMERESS FATALISMS FINALISMS
FISHMEALS FLAMELESS FOAMINESS FOREMASTS FRAMELESS FUMARASES FUSARIUMS
GAMBESONS GAMBUSIAS GAMESHOWS GAMESIEST GAMESTERS GAMEYNESS GASCONISM
GESSAMINE GIANTISMS GLASSWORM GOSSAMERS GOSSAMERY GRAMASHES GRAMPUSES
HAMMINESS HAMPSTERS HANDSOMES HASHMARKS HEMATOSES HEMATOSIS HEMOSTATS
HISPANISM HISTAMINS HOMESTAYS HUMANISES HUMANISMS HUMANISTS HUMANNESS
IDEALISMS IMAGELESS IMPASSION IMPASSIVE INFAMISES INSOMNIAS IOTACISMS
ISARITHMS ISCHEMIAS ISOBARISM ISOCHASMS ISOGAMIES ISOGAMOUS ISOMERASE
ISTHMIANS JEHADISMS JESSAMIES JESSAMINE JIHADISMS JURYMASTS KABALISMS
KAISERISM KHAMSEENS KHANSAMAS KISSAGRAM KISSOGRAM KOMISSARS LABORISMS
LACONISMS LAMBASTES LAMBSKINS LAMISTERS LAMPASSES LAMPERSES LAMPPOSTS
LEGALISMS LOAMINESS LOCALISMS LOSSMAKER LOYALISMS LYSOSOMAL MACARISES
MACARISMS MACASSARS MACHISMOS MACHOISMS MADAROSES MADAROSIS MADERISES
MADHOUSES MADNESSES MADRASAHS MADRASSAH MADRASSAS MAESTOSOS MAGESHIPS
MAGISTERS MAGNESIAS MAIASAURS MAILSACKS MAILSHOTS MAINMASTS MAINSAILS
MAINSTAYS MAISTRIES MAJESTIES MAKEFASTS MALLEUSES MALSTICKS MALTINESS
MALTSTERS MALVASIAS MALVESIES MAMSELLES MANGINESS MANIFESTS MANLINESS
MANSCAPES MANSHIFTS MANSWORNS MANTISSAS MAPSTICKS MARCHESAS MARIPOSAS
MARMOSETS MARQUISES MARSHALLS MARSHIEST MARSPORTS MASCARONS MASCULIST
MASHIACHS MASHLOCHS MASOCHISM MASOCHIST MASONITES MASONRIES MASOOLAHS
MASSACRED MASSACRER MASSACRES MASSAGERS MASSAGING MASSAGIST MASSCULTS
MASSETERS MASSEUSES MASSICOTS MASSINESS MASSIVELY MASSOOLAS MASSTIGES
MASSYMORE MASTABAHS MASTERIES MASTHEADS MASTHOUSE MASTICHES MASTICOTS
MASTODONS MASURIUMS MATCHLESS MATELASSE MATESHIPS MATEYNESS MATRASSES
MATROSSES MAXIDRESS MAXIMISES MAXIMISTS MAXIMUSES MAYBUSHES MAYFISHES
MAZEDNESS MEALINESS MEASLIEST MEASURERS MEATINESS MEDALISTS MEGADOSES
MEGAGAUSS MEGASTARS MELANISES MELANISMS MELANISTS MELANOSES MELANOSIS
MEMSAHIBS MENSWEARS MERSALYLS MESCALINS MESCALISM MESHUGAAS MESOBLAST
MESOCARPS MESOGLEAS MESOPAUSE MESOSAURS MESOSCALE MESOZOANS MESSAGING
MESSALINE MESSIANIC MESSIASES MESSMATES MESSUAGES METABASES METABASIS
METALISES METALISTS METASOMAS MIDSEASON MIDSPACES MISADAPTS MISADJUST
MISADVISE MISAGENTS MISALIGNS MISALLIES MISALLOTS MISALTERS MISARRAYS
MISASSAYS MISASSIGN MISASSUME MISATONES MISAVISED MISAWARDS MISBIASED
MISBIASES MISBRANDS MISCLAIMS MISDREADS MISFAITHS MISFEASOR MISFRAMES
MISGAUGES MISGRADES MISGRAFTS MISHEGAAS MISLABELS MISLABORS MISLAYERS
MISLEARNS MISPAINTS MISPARSED MISPARSES MISPHRASE MISPLACES MISPLANTS
MISPLEADS MISPLEASE MISPRAISE MISRAISED MISRAISES MISSAYING MISSEATED
MISSHAPED MISSHAPEN MISSHAPER MISSHAPES MISSIONAL MISSPACED MISSPACES
MISSPEAKS MISSTAMPS MISSTARTS MISSTATED MISSTATES MISTAKERS MISTRACES
MISTRAINS MISTREATS MISTRIALS MISUSAGES MISVALUES MOCASSINS MOCCASINS
MODALISMS MODALISTS MOLECASTS MONADISMS MONASTICS MONOTASKS MONSTERAS
MOONSAILS MORALISES MORALISMS MORALISTS MORASSIER MORTSAFES MOSAICISM
MOSAICIST MOSASAURI MOSASAURS MOSSBACKS MOSSLANDS MOSSPLANT MOUSEMATS
MOUSEPADS MOUSSAKAS MURALISTS MUSACEOUS MUSCADELS MUSCADETS MUSCADINS
MUSCATELS MUSICALES MUSICIANS MUSSITATE MUSTACHES MYDRIASES MYDRIASIS
MYOBLASTS MYSTAGOGS NABOBISMS NAMASKARS NAMESAKES NASALISMS NATIVISMS
NATURISMS NAVALISMS NEOPLASMS NESTMATES NOMADISES NOMADISMS NYSTAGMUS
OAKMOSSES OBEAHISMS OGHAMISTS OPSIMATHS ORGANISMS OSSARIUMS OSTOMATES
OSTRACISM OUTSHAMES OUTSMARTS OVERMASTS PACIFISMS PAEANISMS PAGANISMS
PALUDISMS PANISLAMS PAPALISMS PARAMESES PARECISMS PARMESANS PAROSMIAS
PAROXYSMS PARTYISMS PASHADOMS PASHMINAS PASPALUMS PASSAMENT PASSEMENT
PASSIVISM PASSMENTS PASTRAMIS PASTROMIS PERMEASES PETALISMS PHALLISMS
PHANTASMS PLASMASOL PLASMOIDS PLASTRUMS PLATEASMS PLATYSMAS PLEONASMS
POSTMARKS POTASSIUM PRESSMARK PRESTAMPS PRIAPISMS PROSAISMS PSALMISTS
PSAMMITES PTYALISMS PYRAMISES QABALISMS QUACKISMS QUALMLESS QUAMASHES
RACEMISES RACEMISMS RAMSHORNS RANSOMERS RASCALISM RASMALAIS REALMLESS
REASSUMED REASSUMES REGALISMS REMASTERS RESAMPLES RHAMNOSES RHAMNUSES
ROMANISES ROSARIUMS ROSHAMBOS ROYALISMS RURALISMS SABBATISM SAECULUMS
SAGAMORES SAILROOMS SAINTDOMS SAINTISMS SALEROOMS SALESROOM SALMONETS
SALMONIDS SAMARIUMS SAMEYNESS SAMIZDATS SAMPHIRES SAMPLINGS SAMSKARAS
SANDPUMPS SANDSTORM SANDWORMS SAPPHISMS SAPREMIAS SARCOSOME SARGASSUM
SATANISMS SATURNISM SAVAGISMS SCALPRUMS SCAMBLERS SCAMPINGS SCAMSTERS
SCANDIUMS SCARMOGES SCHIEDAMS SCHMALZES SCHMATTES SCIMETARS SCIMITARS
SCLEREMAS SCLEROMAS SCOLIOMAS SCOTOMIAS SCRAMBLES SCRAMJETS SCREAMERS
SCRIMSHAW SCUMBALLS SEABREAMS SEADROMES SEALYHAMS SEAMINESS SEAMOUNTS
SEAMSTERS SEATMATES SEISMICAL SELAMLIKS SEMANTICS SEMBLANTS SEMESTRAL
SEMICOMAS SEMIGALAS SEMINATES SEMINOMAS SEMITAURS SEMOLINAS SEMUNCIAS
SERAPHIMS SERIALISM SESAMOIDS SEXUALISM SHAMANISM SHAMANIST SHAMEFAST
SHAMELESS SHAMIANAS SHAMISENS SHAMMASIM SHAMMOSIM SHAMOISED SHAMOISES
SHAMROCKS SHARESMAN SHARESMEN SHAWARMAS SHIPMATES SHMALTZES SHORESMAN
SIAMESING SIDEMEATS SIGHTSMAN SIGMATISM SIMARUBAS SIMAZINES SIMONIACS
SIMULANTS SIMULATES SIMULCAST SINAPISMS SITKAMERS SITZMARKS SKIAGRAMS
SKIDMARKS SLALOMERS SLALOMIST SLAMMINGS SLIMEBAGS SMACKINGS SMALLAGES
SMALLBOYS SMALLNESS SMALLSATS SMALMIEST SMALTINES SMALTITES SMARAGDES
SMARMIEST SMARTARSE SMARTNESS SMASHABLE SMASHEROO SMASHINGS SMEARCASE
SMEARIEST SMIERCASE SOCIALISM SODAMIDES SOLARISMS SOLARIUMS SOMASCOPE
SOMATISMS SOMATISTS SOMEDEALS SOMEWHATS SOMNIATES SONOGRAMS SOULMATES
SPADESMAN SPADESMEN SPAMMIEST SPAMMINGS SPANWORMS SPASMATIC SPASMODIC
SPHAGNUMS SPIRALISM SPOILSMAN SPOKESMAN SPORTSMAN SPUMANTES SPYMASTER
SQUAMATES SQUAMOSAL SQUAMULAS SQUAMULES SQUEAMISH STALAGMAS STAMPEDES
STAMPEDOS STAMPINGS STAMPLESS STATESMAN STATESMEN STAUMRELS STEAMIEST
STEAMINGS STEAMSHIP STEARSMAN STEARSMEN STEATOMAS STEERSMAN STEMHEADS
STEMWARES STEPDAMES STERIGMAS STOMATOUS STRABISMS STRAMMELS STREAMERS
STRIATUMS STUDFARMS STUMPAGES SUBCLAIMS SUBFRAMES SUBHUMANS SUBIMAGOS
SUBMUCOSA SUBSAMPLE SUBSCHEMA SUMMARIES SUMMARISE SUMMARIST SUMPITANS
SURMASTER SURMISALS SURNAMERS SWAMPIEST SWAMPLESS SWARAJISM SWARMINGS
SWIMWEARS SWINGARMS SWORDSMAN SYCAMINES SYCAMORES SYLLABISM SYMITARES
SYMPLASTS SYMPOSIAC SYMPOSIAL SYNGAMIES SYNGAMOUS SYNODSMAN SYNTAGMAS
SYSADMINS TACHISMES TALISMANS TAMARISKS TANTRISMS TEAMSTERS TERATISMS
TESTAMURS TESTATUMS TIRAMISUS TITANISMS TOADYISMS TOTALISMS TRANSMEWS
TRANSMITS TRANSUMES TRIADISMS TRIALISMS ULTRAISMS UNAMASSED UNASSUMED
UNMASKERS UPSTREAMS URBANISMS USERNAMES VASCULUMS VASOSPASM VEGANISMS
VITALISMS VOCALISMS VOLTAISMS WAMPISHES WASHROOMS WASSERMAN WASSERMEN
WOMANISES WOMANISMS WOMANISTS WOMANLESS WOMANNESS WORMCASTS XANTHISMS
YAHOOISMS