There are 569 twelve-letter words containing A, M and 2R, https://www.bestwordlist.com/c/a/4/12letterwordswithamrr.htm
ADRENOCHROME AEROTROPISMS AFTERMARKETS AGRARIANISMS AGRITOURISMS
AGROTOURISMS AIRCRAFTSMAN AIRCRAFTSMEN ALDERMANLIER ALDERMANRIES
ALSTROEMERIA AMELIORATORS AMELIORATORY AMENORRHOEAS AMPEROMETRIC
ANIMADVERTER ANTIRRHINUMS APPRESSORIUM ARAEOMETRIES ARBITRAMENTS
ARBITREMENTS ARCHAEOMETRY ARCHESPORIUM ARITHMOMETER ARMAMENTARIA
AROMATHERAPY ARRAIGNMENTS ARRANGEMENTS ARTERIOGRAMS ARTILLERYMAN
ARTILLERYMEN ASPERSORIUMS ASTROMETRIES ASTROTOURISM BARBARIANISM
BARGEMASTERS BARNSTORMERS BARNSTORMING BAROMETRICAL BAROTRAUMATA
BARRAMUNDIES BENCHWARMERS BOILERMAKERS BRACHYPRISMS BRAGGARTISMS
BRAINSTORMED BRAINSTORMER BREADCRUMBED BREASTSUMMER BROMEGRASSES
BROMOURACILS BROOMBALLERS BURGOMASTERS BUTTERCREAMS CACKERMANDER
CALORIMETERS CALORIMETRIC CAMARADERIES CAMERAPERSON CARPETMONGER
CERAMOGRAPHY CEREBRALISMS CHAIRWARMERS CHARACTERISM CHEIROMANCER
CHIROMANCERS CHOIRMASTERS CHOREODRAMAS CHORUSMASTER CHROMATOGRAM
CIRCUMGYRATE CIRCUMROTATE COMMEMORATOR COMMISERATOR COMPRIMARIOS
COMPURGATORS COMPURGATORY CONFIRMATORS CONFIRMATORY CONTEMPORARY
CORPORATISMS CORPOREALISM COSMOGRAPHER COUNTERCHARM COUNTERMARCH
COUNTERMARKS CRANIOMETERS CRANIOMETRIC CREMAILLERES CREMATORIUMS
CRYMOTHERAPY CRYPTARITHMS CRYPTOMERIAS DARRAIGNMENT DEFRAGMENTER
DEMOCRATISER DEMOCRATIZER DEMOGRAPHERS DEMONSTRATOR DEMORALISERS
DEMORALIZERS DEPROGRAMING DEPROGRAMMED DEPROGRAMMER DEPROGRAMMES
DERMABRASION DERMAPTERANS DESCRAMBLERS DETERMINATOR DIASTEREOMER
DIMERCAPROLS DISEMBARRASS DOCTRINARISM DRAMATURGIES DRAMATURGIST
DRILLMASTERS DRUMBLEDRANE DYSMENORRHEA ELECTROGRAMS EMBARCADEROS
EMBARRASSING ENCUMBRANCER EPIRRHEMATIC ERGATOMORPHS ERYTHRAEMIAS
EUROTERMINAL EVAPORIMETER EVAPOROMETER EXTERMINATOR EXTRAMARITAL
EXTRAMURALLY FAMILIARISER FAMILIARIZER FERRIMAGNETS FERROMAGNETS
FIBROSARCOMA FLAMEPROOFER FLAMETHROWER FORAMINIFERA FORAMINIFERS
FORMULARISED FORMULARISER FORMULARISES FORMULARIZED FORMULARIZER
FORMULARIZES FRATERNALISM FROGMARCHING FRONTIERSMAN GAMEBREAKERS
GASTRONOMERS GENDARMERIES GERRYMANDERS GORILLAGRAMS GORMANDISERS
GORMANDIZERS GRADIOMETERS GRANDMASTERS GRANDMOTHERS GRAVIMETRIES
GRAVITOMETER GRAVITROPISM GREENMAILERS GREGARIANISM GUERRILLAISM
HAEMORRHAGED HAEMORRHAGES HAEMORRHAGIC HAEMORRHOIDS HAMARTHRITIS
HARBORMASTER HARMONICHORD HARMONOGRAMS HARMONOGRAPH HARMONOMETER
HEARTWARMING HEMORRHAGING HEMORRHOIDAL HIERARCHISMS HIEROGRAMMAT
HOROMETRICAL HYDRARGYRISM HYDRARGYRUMS HYDROMANCERS HYDROTHERMAL
HYMNOGRAPHER HYPERMARKETS HYPERREALISM HYPERSARCOMA HYPERTHERMAL
HYPERTHERMIA IAMBOGRAPHER IMMORTALISER IMMORTALIZER IMPERATORIAL
IMPERFORABLE IMPERFORATED IMPERSONATOR IMPREGNATORS IMPROPRIATED
IMPROPRIATES IMPROPRIATOR IMPROVISATOR INCRIMINATOR INCUMBRANCER
INFIRMARIANS INTERCOMPARE INTERFEMORAL INTERLAMINAR INTERMARRIED
INTERMARRIES INTERMEDIARY INTRAMURALLY IPRATROPIUMS IRREDEEMABLE
IRREDEEMABLY IRREFORMABLE IRREFORMABLY IRREMEDIABLE IRREMEDIABLY
JERRYMANDERS KATHAROMETER KERATOMETERS LACHRYMARIES LACHRYMATORS
LACHRYMATORY LAMMERGEIERS LAMMERGEYERS LAMPROPHYRES LAMPROPHYRIC
LARRIKINISMS LEPROSARIUMS LITERARYISMS MACROGRAPHIC MACRONUCLEAR
MACROPTEROUS MADREPORIANS MADREPORITES MADREPORITIC MAGISTRATURE
MAJORITAIRES MAJORITARIAN MANSPREADERS MANUFACTURER MARCONIGRAMS
MARCONIGRAPH MARGRAVIATES MARICULTURES MARPRELATING MARQUETERIES
MARRIAGEABLE MARROWSKYING MARSHBERRIES MARSHLANDERS MARTYROLOGIC
MASQUERADERS MASTERSINGER MASTERSTROKE MASTURBATORS MASTURBATORY
MATERIALISER MATERIALIZER MATRIARCHATE MATRIARCHIES MATRICULATOR
MEMORIALISER MEMORIALIZER MENORRHAGIAS MERCENARISMS MERCHANDISER
MERCHANDIZER MERCHANTRIES MERCURATIONS MERCURIALISE MERCURIALISM
MERCURIALIST MERCURIALITY MERCURIALIZE MERITOCRATIC MERRYMAKINGS
METACERCARIA METALWORKERS METEOROGRAMS METEOROGRAPH METRORRHAGIA
MICROAMPERES MICROCRACKED MICROCRYSTAL MICROFILARIA MICROGRANITE
MICROGRAPHED MICROGRAPHER MICROGRAPHIC MICROGRAVITY MICROMANAGER
MICROPARTIES MICROPROGRAM MICROREADERS MICROTUBULAR MIMOGRAPHERS
MINERALISERS MINERALIZERS MINORITAIRES MISARRANGING MISCARRIAGES
MISMARRIAGES MISPROGRAMED MISREGARDING MITRAILLEURS MIXOBARBARIC
MODERATRICES MODERATRIXES MONOGRAMMERS MONOGRAPHERS MOORBUZZARDS
MORIGERATING MORIGERATION MORPHOGRAPHY MORTARBOARDS MOTHERBOARDS
MOTHERCRAFTS MOTORBOATERS MUCKSPREADER MULTIBARRELS MURDERABILIA
MURMURATIONS MYOFIBRILLAR MYTHOGRAPHER NAMEWORTHIER NECROMANCERS
NEUROFIBROMA NEUROHUMORAL NOMOGRAPHERS NONMERCURIAL NONMIGRATORY
NORMOTHERMIA NURSERYMAIDS OLEOMARGARIN ONEIROMANCER ORGANISTRUMS
OROMAXILLARY OSTRACODERMS OUTMARRIAGES OVERCRAMMING OVERDRAMATIC
OVERENAMORED OVERFAMILIAR OVERGARMENTS OVERMANAGERS OVERMANNERED
OVERMASTERED OVERMATURITY OVERMEASURED OVERMEASURES OVERORNAMENT
OVERPROGRAMS PARACHRONISM PARAMENSTRUA PARAMETERISE PARAMETERIZE
PARAMETRICAL PARAMETRISED PARAMETRISES PARAMETRIZED PARAMETRIZES
PARAMILITARY PARAMORPHINE PARAMORPHISM PARAMORPHOUS PARANORMALLY
PARATHORMONE PARCHMENTIER PARLOURMAIDS PATRIARCHISM PERAMBULATOR
PERFORMANCES PERFORMATIVE PERFORMATORY PERICARDIUMS PERICRANIUMS
PERIMETRICAL PERIOSTRACUM PERMACULTURE PERMEAMETERS PHRASEMAKERS
PHRASEMONGER PHRASEOGRAMS PICROCARMINE PILGRIMAGERS POLARIMETERS
POLARIMETRIC PRAGMATISERS PRAGMATIZERS PREAMPLIFIER PREDOMINATOR
PREFORMATION PREFORMATIVE PREFORMATTED PREFORMULATE PREMARITALLY
PREMARKETING PREMAXILLARY PREMEASURING PREMEDITATOR PREMENSTRUAL
PREMIGRATION PREPRIMARIES PREPROGRAMED PREROMANTICS PRETREATMENT
PRIMIGRAVIDA PRIMORDIALLY PROCLAMATORY PROGRAMMABLE PROGRAMMATIC
PROGRAMMINGS PROMPTUARIES PROMULGATORS PROTOMARTYRS PSEUDOMARTYR
PYRANOMETERS PYROMETRICAL QUARRYMASTER RADIOMETRIES RADIOTHORIUM
READMINISTER REASSORTMENT RECRIMINATED RECRIMINATES RECRIMINATOR
REFLECTOGRAM REFORMATIONS REFORMATTING REFORMULATED REFORMULATES
REFRAINMENTS REHARMONIZED REHARMONIZES REIMBURSABLE REMAINDERING
REMAINDERMAN REMAINDERMEN REMEMBERABLE REMEMBERABLY REMEMBRANCER
REMEMBRANCES REMIGRATIONS REMILITARISE REMILITARIZE REMINERALISE
REMINERALIZE REMONSTRANCE REMONSTRANTS REMONSTRATED REMONSTRATES
REMONSTRATOR REMORALISING REMORALIZING REMORTGAGING REMUNERATING
REMUNERATION REMUNERATIVE REMUNERATORS REMUNERATORY RENORMALISED
RENORMALISES RENORMALIZED RENORMALIZES REPRIMANDING REPROGRAMING
REPROGRAMMED REPROGRAMMES RETRACEMENTS RETRANSFORMS RHABDOMANCER
RHEOMETRICAL RHOMBOHEDRAL RODOMONTADER RONTGENOGRAM ROUTEMARCHED
ROUTEMARCHES SABERMETRICS SACRAMENTARY SCAREMONGERS SCATTERGRAMS
SCHWARMEREIS SCLERODERMAS SCLERODERMIA SCRIMSHANDER SCRIMSHANKER
SEMIARBOREAL SEMICIRCULAR SEMITRAILERS SHAREFARMERS SHAREMILKERS
SKIMBOARDERS SKRIMSHANKER SMORGASBORDS SOLARIMETERS SPECTROGRAMS
STEAMROLLERS STERCORANISM STRABOMETERS STREAMLINERS STRETCHMARKS
STRIPPAGRAMS STRIPPERGRAM STRONGARMING SUBMICROGRAM SUBUMBRELLAR
SUPERHUMERAL SUPERMARKETS SUPERORGASMS SUPERREALISM SUPERSTARDOM
SUPERSTRATUM TELEMARKETER TEMPERATURES TERMITARIUMS TERRAFORMING
TETRADRACHMA TETRADRACHMS TETRAMERISMS TETRAMORPHIC THERMOGRAPHS
THERMOGRAPHY THIRDSTREAMS THREADMAKERS TRADEMARKING TRAMPOLINERS
TRANSFORMERS TRANSFORMING TRANSFORMISM TRANSFORMIST TRANSMIGRANT
TRANSMIGRATE TRANSMITTERS TRANSMOGRIFY TRANSURANIUM TRICHROMATIC
TRIGRAMMATIC TRIMOLECULAR TRINACRIFORM TRIUMVIRATES TROCHEAMETER
TROUBLEMAKER TRUCKMASTERS TRYPARSAMIDE ULTRAMARINES ULTRAREALISM
UNDERDAMPERS UNDERGARMENT UNDERSTRATUM UNMANNERLIER UNPROGRAMMED
UNREFORMABLE UNREMARKABLE UNREMARKABLY UNSCRAMBLERS URANOMETRIES
VAPORIMETERS VERMICULARLY WARMONGERING WATERMARKING WHARFMASTERS
WHOREMASTERS WHOREMASTERY WRECKMASTERS XERODERMATIC