There are 376 fifteen-letter words containing A, M, R and 2S, https://www.bestwordlist.com/c/a/5/15letterwordswithamrss.htm ABSORPTIOMETERS ABSTRACTIONISMS ACRIMONIOUSNESS ADMINISTRATIONS ADMIRABLENESSES AERODYNAMICISTS AGGRANDISEMENTS AGRIBUSINESSMAN AGRIBUSINESSMEN ALLELOMORPHISMS AMBASSADORSHIPS AMORPHOUSNESSES ANAMORPHOSCOPES ANDROMONOECISMS ANTHROPOPHUISMS ANTILIBERALISMS ANTIMILITARISMS ANTIMILITARISTS ANTIMONARCHISTS ANTIQUARIANISMS ANTIRADICALISMS APHELIOTROPISMS ARCHAEOMETRISTS AROMATHERAPISTS ARRONDISSEMENTS ASTRODYNAMICIST BIOREGIONALISMS BLAMEWORTHINESS BREATHARIANISMS BREMSSTRAHLUNGS CARAMELISATIONS CARCINOSARCOMAS CASTANOSPERMINE CASTRAMETATIONS CENTENARIANISMS CENTRIPETALISMS CHEMOTHERAPISTS CHOLESTYRAMINES CHORDAMESODERMS CHROMATICNESSES CHROMATOLOGISTS CHROMATOSPHERES CIRCUMSTANTIALS CLAMOROUSNESSES COCHAIRMANSHIPS COMFORTABLENESS COMMENSURATIONS COMMISSARYSHIPS COMMISSIONAIRES COMPARATIVENESS COMRADELINESSES CONFORMABLENESS CONSERVATORIUMS CONSIMILARITIES CONVERSATIONISM COUNTERMEASURES CRUCIVERBALISMS CUSTOMARINESSES DEMISEMIQUAVERS DEMORALISATIONS DERMATOMYOSITIS DERMATOPHYTOSES DERMATOPHYTOSIS DERMATOPLASTIES DETERMINATENESS DIAPHRAGMITISES DIASTEREOISOMER DICHROMATICISMS DISAFFIRMATIONS DISAFFORESTMENT DISARRANGEMENTS DISCIPLINARIUMS DISCOMBOBERATES DISCOURAGEMENTS DISCRIMINATIONS DISEMBARKATIONS DISEMBARRASSING DISENCUMBRANCES DISENTHRALMENTS DISENTRAINMENTS DISFEATUREMENTS DISHARMONIOUSLY DISHEARTENMENTS DISINFORMATIONS DISSIMILARITIES DISTEMPERATURES DRAUGHTSMANSHIP DREAMLESSNESSES ECCREMOCARPUSES ECLAIRCISSEMENT EGALITARIANISMS EMBRACINGNESSES EMPIRICALNESSES ENDOPARASITISMS EPHEMERALNESSES EPIGRAMMATISERS EXEMPLARINESSES EXTEMPORARINESS FERRIMAGNETISMS FERROMAGNETISMS FERROMANGANESES FIDEICOMMISSARY FLEXITARIANISMS FORISFAMILIATES FORMATIVENESSES FRAGMENTARINESS GALVANOTROPISMS GEOMETRISATIONS GLAMOROUSNESSES GRAMMATICALNESS GRAMMATICASTERS GRAMMATOLOGISTS HEADMASTERLIEST HEADMASTERSHIPS HEADMISTRESSIER HEARTSOMENESSES HEMOCHROMATOSES HEMOCHROMATOSIS HETEROTHALLISMS HOMOCHROMATISMS HOMOTRANSPLANTS HYPERPARASITISM HYPERSTIMULATES HYPOCHONDRIASMS IMAGINARINESSES IMMISERISATIONS IMMISERIZATIONS IMPARTIALNESSES IMPERMEABLENESS IMPERSONALISING IMPERSONALITIES IMPERVIABLENESS IMPORTUNATENESS IMPRACTICALNESS IMPREGNABLENESS IMPROVISATRICES IMPROVISATRIXES IMPROVVISATORES INCREMENTALISMS INCREMENTALISTS INFORMATIVENESS INNUMERABLENESS INSPIRATIONISMS INSTRUMENTALISM INSTRUMENTALIST INTEMPERATENESS INTERACTIONISMS INTERSEXUALISMS INTRANSIGENTISM INTRANSMISSIBLE IRREMOVABLENESS LEGERDEMAINISTS LIBERTARIANISMS LIPOGRAMMATISMS LIPOGRAMMATISTS MACROSTRUCTURES MAGISTERIALNESS MAGISTRATESHIPS MALADROITNESSES MARSHMALLOWIEST MARVELOUSNESSES MASSOTHERAPISTS MASTERFULNESSES MATERFAMILIASES MATRIARCHALISMS MEASURABILITIES MEASURELESSNESS MEGASPOROPHYLLS MEMORABLENESSES MENISPERMACEOUS MENSURABILITIES MERCENARINESSES MERCURIALNESSES METACHROMATISMS MICROAGGRESSION MICROAGGRESSIVE MICROAGGRESSORS MICROPULSATIONS MICROSATELLITES MILITARISATIONS MILLENARIANISMS MILLIONAIRESSES MINERALISATIONS MINISTERIALISTS MISAPPREHENSION MISAPPREHENSIVE MISAPPROPRIATES MISARRANGEMENTS MISATTRIBUTIONS MISCELLANARIANS MISCHARACTERISE MISCORRELATIONS MISERABLENESSES MISGOVERNAUNCES MISINFORMATIONS MISMEASUREMENTS MISORIENTATIONS MISREGISTRATION MISTRANSCRIBING MISTRANSLATIONS MOMENTARINESSES MONGRELISATIONS MONOCHROMATISMS MONOSACCHARIDES MONOUNSATURATES MULTIRACIALISMS MUSICOTHERAPIES NARCOTERRORISMS NECESSARIANISMS NEOCONSERVATISM NEPHROBLASTOMAS NEUROANATOMISTS NIGHTMARISHNESS NONCHARISMATICS NONRANDOMNESSES NORMATIVENESSES OMNIFARIOUSNESS OPERATIONALISMS OSMOREGULATIONS OUTDOORSMANSHIP OVERADJUSTMENTS OVERASSESSMENTS OVERCOMPENSATES OVEREMPHASISING OVERENTHUSIASMS OVERESTIMATIONS PARAGRAMMATISTS PARAJOURNALISMS PARAMYXOVIRUSES PATERFAMILIASES PATRIARCHALISMS PERIPATETICISMS PERMANENTNESSES PERMEABLENESSES PHALLOCENTRISMS PHANTASMAGORIAS PHANTASMAGORIES PHARMACOGNOSIES PHARMACOGNOSIST PHARMACOLOGISTS PHARMACOPOEISTS PHARMACOPOLISTS PLETHYSMOGRAPHS POCOCURANTEISMS POLYCHROMATISMS POLYMERISATIONS POSTMASTERSHIPS POSTSTIMULATORY PRAGMATICALNESS PRAGMATISATIONS PREMATURENESSES PRESBYTERIANISM PRESENTATIONISM PROBABILIORISMS PROCELEUSMATICS PROFESSIONALISM PROLETARIANISMS PROSENCHYMATOUS PROSTATECTOMIES PROXIMATENESSES PSEUDOMEMBRANES PSILANTHROPISMS PYRAMIDOLOGISTS QUARRELSOMENESS QUARTERMISTRESS QUATTROCENTISMS RADIOSTRONTIUMS REACTIONARYISMS REAPPRAISEMENTS REESTABLISHMENT REFORMATIONISTS REMOBILISATIONS REMONETISATIONS REMORALISATIONS REMOVABLENESSES RESTORATIONISMS RESYSTEMATISING RESYSTEMATIZING RETINOBLASTOMAS RETRANSMISSIONS RHEUMATOLOGISTS RUDIMENTARINESS SABERMETRICIANS SACCHARIMETRIES SACCHAROMETRIES SACCHAROMYCETES SACRAMENTALISMS SACRAMENTALISTS SACRAMENTALNESS SACRAMENTARIANS SARCENCHYMATOUS SCAREMONGERINGS SCHOOLMASTERING SCHOOLMASTERISH SCLERODERMATOUS SCRIMSHANDERING SEISMOGRAPHICAL SEMIABSTRACTION SEMICRYSTALLINE SEMIPARASITISMS SEMITERRESTRIAL SEMITRANSLUCENT SEMITRANSPARENT SERVOMECHANISMS SHOCKUMENTARIES SPERMATOBLASTIC SPERMATOGENESES SPERMATOGENESIS SPERMATORRHOEAS SPHYGMOGRAPHIES STALAGMOMETRIES STRABISMOMETERS STREPHOSYMBOLIA SUBLAPSARIANISM SUBMETACENTRICS SUBMINIATURISED SUBMINIATURISES SUBMINIATURIZES SUPERHUMANISING SUPERHUMANITIES SUPERMAJORITIES SUPERNATURALISM SUPERNUMERARIES SUPERORGANICISM SUPERPARASITISM SUPERPATRIOTISM SUPERSTIMULATED SUPERSTIMULATES SUPPLEMENTARIES SYMBOLOGRAPHIES SYMMETRICALNESS SYMMETRISATIONS SYMMETRIZATIONS SYMMETROPHOBIAS TARSOMETATARSAL TARSOMETATARSUS TELEJOURNALISMS TELOMERISATIONS TEMERARIOUSNESS TEMPERATENESSES TEMPORARINESSES TERRITORIALISMS TETARTOHEDRISMS THERMAESTHESIAS THERMALISATIONS THROMBOPLASTINS TOASTMISTRESSES TRADITIONALISMS TRANSAMINATIONS TRANSFORMATIONS TRANSGENDERISMS TRANSMIGRATIONS TRANSMISSOMETER TRANSMITTANCIES TRANSSEXUALISMS TRANSVESTITISMS TRAUMATISATIONS TRAUMATONASTIES TRIPERSONALISMS TRYPANOSOMIASES TRYPANOSOMIASIS ULTRAMODERNISMS ULTRAMODERNISTS ULTRAMONTANISMS ULTRAMONTANISTS UNDEREMPHASISED UNDEREMPHASISES UNDEREMPHASIZES UNDERSTATEMENTS UNSECTARIANISMS UNSPORTSMANLIKE UNTRANSMISSIBLE UTILITARIANISMS VISCOSIMETRICAL WARMHEARTEDNESS WEARISOMENESSES