There are 989 twelve-letter words containing A, O, R and 2S, https://www.bestwordlist.com/c/a/5/12letterwordswithaorss.htm ABNORMALISMS ABORTIONISTS ABORTIVENESS ABSORBANCIES ABSORBENCIES ABSORPTANCES ABSTRACTIONS ABSTRICTIONS ACAROLOGISTS ACCESSORISED ACCESSORISES ACCESSORIZED ACCESSORIZES ACHROMATISES ACHROMATISMS ACROCYANOSES ACROCYANOSIS ADENOVIRUSES ADIAPHORISMS ADIAPHORISTS ADORABLENESS ADROITNESSES ADSCRIPTIONS AECIDOSPORES AERONEUROSES AERONEUROSIS AEROSOLISING AEROSTATIONS AEROTROPISMS AGRITOURISMS AGRITOURISTS AGROBUSINESS AGROTOURISMS AGROTOURISTS AHISTORICISM ALDOSTERONES ALLEGORISERS ALLOSAURUSES ALLOTROPISMS ALPROSTADILS AMBIVERSIONS ANACHRONISMS ANAEROBIOSES ANAEROBIOSIS ANAMORPHISMS ANAMORPHOSES ANAMORPHOSIS ANASTROZOLES ANDROGENESES ANDROGENESIS ANDROLOGISTS ANISOTROPIES ANISOTROPISM ANKYLOSAURUS ANORTHOSITES ANOTHERGUESS ANSWERPHONES ANTEVERSIONS ANTHRACNOSES ANTISTROPHES APHRODISIACS APLANOSPORES APOSTROPHISE APOTROPAISMS APPRESSORIUM AQUAFORTISES AQUAFORTISTS ARABINOSIDES ARABISATIONS ARAEOSYSTYLE ARCHDIOCESES AREOSYSTILES ARISTOLOGIES ARRESTATIONS ARROWGRASSES ARTHROSCOPES ARTHROSPORES ARTOCARPUSES ASPERGATIONS ASPERSORIUMS ASPHYXIATORS ASPORTATIONS ASSASSINATOR ASSESSORSHIP ASSEVERATION ASSIMILATORS ASSIMILATORY ASSORTEDNESS ASTEROIDEANS ASTRAPHOBIAS ASTROCOMPASS ASTROCYTOMAS ASTROHATCHES ASTROLATRIES ASTROLOGISTS ASTROMETRIES ASTRONAUTICS ASTRONOMISED ASTRONOMISES ASTRONOMIZES ASTROPHOBIAS ASTROPHYSICS ASTROSPHERES ASTROTOURISM ASTROTOURIST ASTROTURFERS ASYNCHRONIES ASYNCHRONISM ASYNCHRONOUS ATHROCYTOSES ATHROCYTOSIS ATMOSPHERICS ATTORNEYISMS AUDITORSHIPS AUSCULTATORS AUTOEROTISMS AUTOREVERSES AUTOSAMPLERS AZOOSPERMIAS BACHELORISMS BACKCROSSING BACKSTROKERS BARNSTORMERS BARONETESSES BAROPHORESES BAROPHORESIS BARRELHOUSES BARYOGENESES BARYOGENESIS BASIDIOCARPS BASIDIOSPORE BEHAVIORISMS BEHAVIORISTS BILHARZIOSES BILHARZIOSIS BIOGRAPHISES BLADDERNOSES BLASTOSPHERE BLASTOSPORES BLOODSTREAMS BOARDERCROSS BOARDSAILORS BONDSERVANTS BOUNDARYLESS BRACHIOSAURS BRASSFOUNDER BREASTSTROKE BROADCASTERS BROMEGRASSES BRONCHOSPASM BRONTOSAURUS BURGOMASTERS BURSERACEOUS CANEPHORUSES CANOROUSNESS CARBOXYLASES CARILLONISTS CARPOLOGISTS CATAPHORESES CATAPHORESIS CATASTROPHES CERATOPSIANS CEROPLASTICS CESSIONARIES CHAIRPERSONS CHANSONNIERS CHEESEBOARDS CHIAROSCUROS CHLOROPLASTS CHOIRMASTERS CHORIAMBUSES CHORISATIONS CHORUSMASTER CHRISMATIONS CHROMOPLASTS CHRYSAROBINS CHRYSOCOLLAS CHRYSOPRASES CIRROSTRATUS CLEARSTORIES COARSENESSES COASTEERINGS COELUROSAURS COINSURANCES COLOURWASHES COMMISERATES COMMISSAIRES COMMISSARIAL COMMISSARIAT COMMISSARIES COMPARATISTS COMPENSATORS COMRADESHIPS CONFISCATORS CONSECRATORS CONSECTARIES CONSERVATISE CONSERVATISM CONSERVATORS CONSISTORIAL CONSISTORIAN CONSPIRACIES CONSPIRACIST CONSPIRATORS CONSTERNATES CONSTRAINERS CONSTUPRATES CONSUMMATORS CONTRABASSES CONTRABASSOS CONTRABBASSI CONTRABBASSO CONTRARINESS CONTRASTIEST CONTREDANSES CONVERSANCES CORIVALSHIPS CORNSTARCHES CORPORATISES CORPORATISMS CORPORATISTS CORUSCATIONS CORYBANTISMS COSCENARISTS COSMOLATRIES COTONEASTERS COTRANSDUCES COTRANSPORTS COUNTERBASES COUNTERSEALS COUNTRYSEATS COWARDLINESS CRAFTSPERSON CRAPSHOOTERS CREATIONISMS CREATIONISTS CREATORSHIPS CRESCOGRAPHS CRETACEOUSES CROAKINESSES CROSSABILITY CROSSBANDING CROSSBARRING CROSSBEARERS CROSSHATCHED CROSSHATCHES CROSSMATCHED CROSSMATCHES CROSSPATCHES CRYSTALLOIDS CURATORSHIPS DEBONAIRNESS DECARBONISES DEFORMALISES DEGLAMORISES DEMOCRATISES DEMOCRATISTS DEMONSTRATES DEMORALISERS DEPOLARISERS DEPOSITARIES DESALINATORS DESECRATIONS DESPERATIONS DIACHRONISMS DIASCORDIUMS DIASTROPHISM DIATESSARONS DIGRESSIONAL DILATORINESS DISAFFORESTS DISAPPROVALS DISAPPROVERS DISASTROUSLY DISAUTHORISE DISAVENTROUS DISCEPTATORS DISCOPHORANS DISCORDANCES DISCOURAGERS DISFAVOURERS DISGARRISONS DISHARMONIES DISHARMONISE DISORGANISED DISORGANISER DISORGANISES DISORGANIZES DISPENSATORS DISPENSATORY DISRELATIONS DISSEMINATOR DISSERTATION DISSERTATORS DISSIMULATOR DISSUASORIES DISTRACTIONS DOLLARFISHES DOWNSTAIRSES DOWNWARDNESS DRACONTIASES DRACONTIASIS DRAFTSPERSON DRAGONFISHES DROSERACEOUS EAVESTROUGHS EMASCULATORS ENDORSATIONS ENTEROBIASES ENTEROBIASIS EPANORTHOSES EPANORTHOSIS EPISTOLARIES ERGASTOPLASM EROTISATIONS ERYTHROPSIAS ESCARMOUCHES ESTERISATION ESTRAMAZONES ESTRANGHELOS EVISCERATORS EXASPERATORS EXOPARASITES EXPRESSIONAL EXTRASENSORY EXTRASYSTOLE FAIRYFLOSSES FALDISTORIES FAVOUREDNESS FAVOURITISMS FEARSOMENESS FISSIROSTRAL FLUSTRATIONS FOOLHARDISES FORECASTINGS FOREMANSHIPS FORESTALLERS FORESTATIONS FORESTAYSAIL FORETOPMASTS FORMALNESSES FORMULARISES FORNICATRESS FORSAKENNESS FRACTIONISES FRUSTRATIONS GAMOTROPISMS GANGSTERDOMS GARBOLOGISTS GASTROLOGERS GASTROLOGIES GASTROLOGIST GASTRONOMERS GASTRONOMICS GASTRONOMIES GASTRONOMIST GASTROPLASTY GASTROPODANS GASTROPODOUS GASTROSCOPES GASTROSCOPIC GASTROSOPHER GASTROTOMIES GASTROTRICHS GLABROUSNESS GLASSBLOWERS GLASSWORKERS GLOBULARNESS GLOSSARIALLY GLOSSOGRAPHY GOOSEGRASSES GORMANDISERS GOSSAMERIEST GOURMANDISES GOURMANDISMS GRACIOSITIES GRACIOUSNESS GRASSHOPPERS GREASEPROOFS GROATSWORTHS GROSSULARITE GROUNDMASSES GROUNDSHARES HAMMERSTONES HANDYPERSONS HARBOURSIDES HARMONICISTS HARPSICHORDS HEARTHSTONES HEROICALNESS HETEROSCIANS HETEROUSIANS HOARSENESSES HOMESTEADERS HORSEMANSHIP HORSEPLAYERS HORSERACINGS HOSPITALLERS HOUSEBOATERS HOUSEFATHERS HOUSEMASTERS HOUSEPARENTS HYDROGENASES HYDROLYSATES HYDROMASSAGE HYDROMEDUSAS HYDROSTATICS HYDROXYLASES HYGROCHASIES HYPERSOMNIAS HYPOCORISMAS IATROGENESES IATROGENESIS ICHTHYOSAURS ICOSAHEDRONS IDEOPRAXISTS IDIOSYNCRASY IDOLATRESSES IDOLATRISERS IGNORANTNESS ILLUSTRATORS IMMORTALISES IMPERSONATES IMPRESSIONAL IMPROVISATES INCRASSATION INDORSATIONS INFORMATISES INSALUBRIOUS INSEMINATORS INSPIRATIONS INSPISSATORS INSTAURATORS INSUFFLATORS INTERCOSTALS IRIDISATIONS IRONICALNESS ISODIAPHERES ISOMETROPIAS ISOSTHENURIA JANITORSHIPS JOHNSONGRASS JOURNALISERS KARYOKINESES KARYOKINESIS KARYOLOGISTS KEYBOARDISTS KWASHIORKORS LABOUREDNESS LANDLORDISMS LAPAROSCOPES LARYNGOSPASM LEASEHOLDERS LEMONGRASSES LEOPARDESSES LEOPARDSKINS LEPROSARIUMS LOUDSPEAKERS MACROCYTOSES MACROCYTOSIS MACROFOSSILS MACROPHYSICS MAISTERDOMES MALAPROPISMS MALAPROPISTS MANORIALISMS MANSIONARIES MARCATISSIMO MARSHLOCKSES MARSHMALLOWS MASSOTHERAPY MASTERSTROKE MASTURBATORS MATRONLINESS MAYSTERDOMES MEGALOSAURUS MEGASTARDOMS MEMORIALISES MEMORIALISTS MENSURATIONS MESOGASTRIUM MESOTHORACES MESOTHORAXES METAPHORISTS METROSEXUALS MISANTHROPES MISANTHROPOS MISBEHAVIORS MISCREATIONS MISDEMEANORS MISRELATIONS MISSIONARIES MISSIONARISE MISSIONARIZE MODERATENESS MONOCRYSTALS MONOLATRISTS MOSASAURUSES MYOGRAPHISTS NANOCRYSTALS NARCOLEPSIES NARROWNESSES NEGOTIATRESS NIMBOSTRATUS NITROGENASES NITROSAMINES NITROSATIONS NONABRASIVES NONASSERTIVE NONCLASSROOM NONPARTISANS NONPASSERINE NONRESISTANT NONRESONANTS NONSTANDARDS NORTHEASTERS NOSOGRAPHERS NOSOGRAPHIES NUGATORINESS OARSMANSHIPS OBDURATENESS OBSCURANTISM OBSCURANTIST OBSCURATIONS OBSECRATIONS OBSERVANCIES OBSERVATIONS OBSTROPALOUS OPERATORLESS ORACULARNESS ORCHARDGRASS ORCHESTRATES ORCHESTRINAS ORDINARINESS ORGANISTRUMS ORIENTALISES ORIENTALISMS ORIENTALISTS ORIGINALISMS ORIGINALISTS ORNAMENTISTS ORNATENESSES ORNITHOSAURS OSCILLOGRAMS OSCULATORIES OSMOLARITIES OSTEOSARCOMA OSTRACISABLE OSTRACODERMS OSTREOPHAGES OUTORGANISES OVERANALYSES OVERANALYSIS OVERAROUSALS OVERASSERTED OVERASSESSED OVERASSESSES OVERCASTINGS OVERCLASSIFY OVEREMPHASES OVEREMPHASIS OVERGRASSING OVERHARVESTS OVERISSUANCE OVERLAVISHES OVERMEASURES OVERRASHNESS PANTISOCRATS PARACROSTICS PARAGLOSSATE PARAMASTOIDS PARAPHIMOSES PARAPHIMOSIS PARAPOPHYSES PARAPOPHYSIS PARASTICHOUS PARFOCALISES PARISHIONERS PARKINSONISM PARONOMASIAS PARONOMASIES PARROTFISHES PARSIMONIOUS PARVOVIRUSES PASSAGEWORKS PASSIONARIES PASTORALISMS PASTORALISTS PASTORALNESS PASTOURELLES PATERNOSTERS PATROLOGISTS PATROONSHIPS PENSIONARIES PERCUSSIONAL PERESTROIKAS PERFORATUSES PERSONALISED PERSONALISES PERSONALISMS PERSONALISTS PERSONALIZES PERSONALTIES PERSONATINGS PERSONATIONS PHOSPHORATES PHRASEOGRAMS PHYSIOLATERS PLASTERSTONE PLASTERWORKS PLASTOMETERS PLOUGHSHARES POETASTERIES POLARISCOPES POLYAMORISTS POLYCRYSTALS POLYSORBATES POPULARISERS PORTRAITISTS POSTILLATORS POSTORGASMIC POSTSURGICAL PRAETORSHIPS PREADMISSION PRECESSIONAL PREDISPOSALS PROBABILISMS PROBABILISTS PROCESSIONAL PRODIGALISES PROFESSIONAL PROFESSORATE PROFESSORIAL PROFESSORIAT PROGNATHISMS PROSAUROPODS PROSENCHYMAS PROSOBRANCHS PROSOPOPEIAS PROSTRATIONS PROTAGONISMS PROTAGONISTS PROTHALLUSES PROVABLENESS PROVISIONALS PSEUDOGRAPHS PSEUDOSCALAR PSYCHODRAMAS PSYCHOGRAPHS PYROCLASTICS QUADRASONICS QUAESTORSHIP RADIOLOGISTS RADIOSCOPIES RALLYCROSSES RANDOMNESSES RAPSCALLIONS RATIONALISES RATIONALISMS RATIONALISTS RATIONALNESS RAVENOUSNESS REACCESSIONS REACTIONISMS REACTIONISTS READMISSIONS REALISATIONS REASCENSIONS REASONLESSLY REASSERTIONS REASSORTMENT REASSUMPTION REAUTHORISES REBROADCASTS RECESSIONALS RECESSIONARY REGIONALISES REGIONALISMS REGIONALISTS REINSTATIONS RELATIONISMS RELATIONISTS RELATIONLESS REMONSTRANTS REMONSTRATES RENORMALISES REORGANISERS REPROACHLESS RESERVATIONS RESIGNATIONS RESOCIALISED RESOCIALISES RESOCIALIZES RESPIRATIONS RESPONSORIAL RESTORATIONS RESTORATIVES RESUSCITATOR RESVERATROLS RETINISPORAS RETINOSPORAS RETRANSFORMS RETROSEXUALS RETROUSSAGES RHAPSODISING RHAPSODISTIC ROCKSTEADIES ROMANTICISES ROMANTICISMS ROMANTICISTS ROUGHCASTERS RUSTICATIONS SABURRATIONS SACRILEGIOUS SACROCOSTALS SACROILIITIS SAILBOARDERS SALESPERSONS SALINOMETERS SALTATORIOUS SALUBRIOUSLY SALUTATORIES SALUTIFEROUS SANCTIONEERS SANDERSWOODS SANGUIFEROUS SANGUIVOROUS SAPROLEGNIAS SAPROPELITES SAPROPHAGOUS SAPROPHYTISM SARCOMATOSES SARCOMATOSIS SARCOPHAGOUS SARCOPLASMIC SARDONICISMS SARRUSOPHONE SATINFLOWERS SATIRISATION SATISFACTORY SAUROPSIDANS SAVORINESSES SCABROUSNESS SCARABAEOIDS SCARAMOUCHES SCAREMONGERS SCATTERGOODS SCHOLARLIEST SCHOLARSHIPS SCHOOLCRAFTS SCHOOLMASTER SCHORLACEOUS SCISSORTAILS SCLERODERMAS SCOLOPENDRAS SCORPAENOIDS SCOUTMASTERS SCRAPBOOKERS SCRIVEBOARDS SEAWORTHIEST SEGREGATIONS SEIGNIORAGES SEISMOGRAPHS SEISMOGRAPHY SELECTORATES SELENOGRAPHS SENATORSHIPS SEPARATORIES SEPIOSTAIRES SEQUESTRATOR SERRULATIONS SERVANTHOODS SHADOWGRAPHS SHAREHOLDERS SHARPSHOOTER SHOOTAROUNDS SHOPBREAKERS SHORTCHANGES SHORTGRASSES SHOVELBOARDS SIALORRHOEAS SIDEROPENIAS SIDEROSTATIC SINANTHROPUS SINISTRORSAL SKIMBOARDERS SLANDEROUSLY SLAUGHTEROUS SLAVEHOLDERS SLAVOCRACIES SMALLHOLDERS SMORGASBORDS SNAPSHOOTERS SNOBOCRACIES SNOWBOARDERS SOCKDOLAGERS SOLARIMETERS SOLARISATION SOLIDARISTIC SOLIDARITIES SOLITARINESS SOMERSAULTED SONOGRAPHERS SONOGRAPHIES SOUTHEASTERN SOUTHEASTERS SOUTHLANDERS SPARROWFARTS SPARROWGRASS SPARROWHAWKS SPATTERDOCKS SPATTERWORKS SPECTROGRAMS SPHEROPLASTS SPHYGMOGRAMS SPIROCHAETES SPLASHBOARDS SPORANGIOLES SPORTCASTERS SPORTSCASTER SPORULATIONS SPRINGBOARDS SQUARSONAGES STABILISATOR STACTOMETERS STADIOMETERS STADTHOLDERS STAKEHOLDERS STAKTOMETERS STALLHOLDERS STANNIFEROUS STATESPERSON STATIONARIES STATIONERIES STATOLATRIES STAUROSCOPES STAUROSCOPIC STEAMROLLERS STEAROPTENES STEATORRHEAS STEGANOGRAMS STEGOCARPOUS STEGOSAURIAN STELLARATORS STENOCARDIAS STERCORANISM STERCORANIST STERCORARIES STEREOGRAPHS STEREOTAXIAS STERNOCOSTAL STERNUTATORS STIGMASTEROL STILLATORIES STONEBRASHES STONEMASONRY STONEWALLERS STRABOMETERS STRABOTOMIES STRANDWOLVES STRATOPAUSES STRATOSPHERE STRAWFLOWERS STRIDULATORS STRINGBOARDS STROPHANTHUS STYRACACEOUS SUBARRATIONS SUBCONTRACTS SUBERISATION SUBHARMONICS SUBLITTORALS SUBORDINATES SUBORNATIONS SUBROGATIONS SUBSTRACTION SUBSTRACTORS SUBTRACTIONS SUDORIPAROUS SULFURATIONS SULPHURATORS SUPERABOUNDS SUPERCARGOES SUPERNATIONS SUPEROCTAVES SUPERORGASMS SUPERPOSABLE SUPERSTARDOM SUPERSTATION SUPERWEAPONS SUPPORTANCES SUPPURATIONS SURADDITIONS SURFBOARDERS SURROGATIONS SUSPENSORIAL SUSPIRATIONS SUSTENTATORS SUSURRATIONS SWALLOWWORTS SWITCHBOARDS SWORDBEARERS SWORDPLAYERS SYLLABOGRAMS SYMPOSIARCHS SYNANTHEROUS SYNARTHROSES SYNARTHROSIS SYNCHROFLASH TAUTOMERISMS TEMPORALISES TEMPORALNESS TETRAPOLISES TETRASPOROUS THALASSOCRAT THOROUGHBASS THROATLASHES TOASTMASTERS TORSIOGRAPHS TOTALISATORS TOWARDLINESS TOWARDNESSES TOXOCARIASES TOXOCARIASIS TRADESPERSON TRAILBASTONS TRAITORESSES TRAITORSHIPS TRANSACTIONS TRANSDUCTORS TRANSECTIONS TRANSFIXIONS TRANSFORMERS TRANSFORMISM TRANSFORMIST TRANSFUSIONS TRANSGRESSOR TRANSLATIONS TRANSLOCATES TRANSMISSION TRANSPERSONS TRANSPHOBIAS TRANSPICUOUS TRANSPONDERS TRANSPONDORS TRANSPORTALS TRANSPORTERS TRANSPOSABLE TRANSPOSINGS TRANSVERSION TRAPSHOOTERS TRITAGONISTS TROMBIDIASES TROMBIDIASIS TROPHOBLASTS TROPHOPLASMS TROPICALISES TRYPANOSOMES TYRANNOSAURS ULTRASERIOUS UNDERPASSION UNSAVORINESS UNSAVOURIEST UNTOWARDNESS UROLITHIASES UROLITHIASIS UTOPIANISERS VAPORISHNESS VAPOROSITIES VAPOROUSNESS VARICOSITIES VARSOVIENNES VASODILATORS VASOPRESSINS VASOPRESSORS VESICATORIES VOLUNTARISMS VOLUNTARISTS WAREHOUSINGS WARRIORESSES WATERCOURSES WHISKERANDOS WHOREMASTERS WORDSEARCHES WORKABLENESS WORKAHOLISMS WORKMANSHIPS WORKSTATIONS ZOOGRAPHISTS