There are 638 eight-letter words containing A, O and 2S, https://www.bestwordlist.com/c/a/4/8letterwordswithaoss.htm
ABOMASUS ABROSIAS ABSCONDS ABSOLVES ABUSIONS ACCOASTS ACIDOSES
ACIDOSIS ACOSMISM ACOSMIST ADENOSES ADENOSIS ADIPOSES ADIPOSIS
ADONISES ADVISORS AEROSATS AEROSOLS AGAROSES AGISTORS AGLOSSAL
AGLOSSIA AGNOSIAS AGONISES AGONISMS AGONISTS AIRPOSTS AIRSHOTS
AIRSHOWS AIRSTOPS ALASTORS ALECOSTS ALLSORTS ALPHOSIS ALTOISTS
AMEIOSES AMEIOSIS AMITOSES AMITOSIS AMORISMS AMORISTS AMOROSAS
AMOROSOS AMOSITES AMYLOSES ANEMOSES ANEMOSIS ANISOLES ANODISES
ANOPSIAS ANOSMIAS ANSEROUS ANTIBOSS APOAPSES APOAPSIS APODOSES
APODOSIS APOSTASY APOSTILS APOSTLES APPOSERS ARGOSIES AROUSALS
AROUSERS ARSENOUS ARSONIST ARSONOUS ASBESTOS ASINICOS ASOCIALS
ASPEROUS ASPERSOR ASSENTOR ASSERTOR ASSESSOR ASSHOLES ASSIENTO
ASSIGNOR ASSISTOR ASSOILED ASSONANT ASSONATE ASSORTED ASSORTER
ASSOTTED ASSURORS ASTHORES ASTOMOUS ASTONIES ASTONISH ASTOUNDS
ASTROIDS ASYSTOLE ATISHOOS ATOMISES ATOMISMS ATOMISTS AUSFORMS
AZOTISES AZYGOSES BARONESS BASOCHES BASSOONS BASSWOOD BASTIONS
BATHOSES BIOASSAY BIOGASES BOASTERS BOBSTAYS BOMBASTS BONASSUS
BONSELAS BOREASES BORSTALS BOSCAGES BOSKAGES BRASEROS BUSLOADS
CABOOSES CAESIOUS CAISSONS CALLOSES CALYPSOS CANONESS CARASSOW
CAROUSES CASEOSES CASSINOS CASSIOPE CASSOCKS CASSONES CASTOCKS
CASTOFFS CAVESSON CELOSIAS CHAMISOS CHANSONS CLASSICO CLASSONS
COALISES COALLESS COARSENS COARSEST COARSISH COASSIST COASSUME
COASTERS COATLESS COLOSSAL CONTESSA CORSAGES CORSAIRS COSPLAYS
COSSACKS COSTARDS COSTEANS COWGRASS CROSSARM CROSSBAR CROSSWAY
CRUSADOS CURASSOW CYANOSES CYANOSIS DAMOSELS DAPSONES DASHPOTS
DASYPODS DEASOILS DEPOSALS DISAVOWS DISLOADS DISPOSAL DOWLASES
DROSERAS EARSHOTS EASTMOST ENOLASES ERASIONS ESCALOPS ESCOLARS
ESPARTOS ESPOUSAL EVASIONS EXPOSALS FAMOUSES FASCISMO FASHIONS
FASHIOUS FASTUOUS FIASCOES FLOTSAMS FOAMLESS FOGASHES FOOTSALS
FORESAYS FORSAKES FOSSULAE FOUGASSE FUSAROLS GALOSHES GALOWSES
GAOLLESS GASAHOLS GASHOUSE GASOHOLS GASWORKS GESTAPOS GIRASOLS
GLASNOST GLOSSARY GLOSSINA GOALLESS GOLIASES GOSHAWKS GOSSAMER
GROSSART HAPLOSES HAPLOSIS HARMOSTS HAROSETS HASSOCKS HASSOCKY
HEXOSANS HOARSENS HOARSEST HOPSACKS HOSANNAS HOSTAGES HOUSESAT
IMPASTOS ISAGOGES ISOAMYLS ISOBARES ISOBASES ISOBATHS ISOCHASM
ISOGRAMS ISOLATES ISOLEADS ISOPACHS ISOSTACY ISOSTASY ISOTACHS
JALOUSES KAROSHIS KAROSSES KOLBASIS KOLBASSA KOLBASSI KOMISSAR
LACROSSE LACTOSES LASSLORN LASSOCKS LASSOERS LASSOING LATOSOLS
LEASOWES LIAISONS LOAMLESS LOESSIAL LOPGRASS MADISONS MAESTOSO
MAESTROS MAFIOSOS MALISONS MALTOSES MANNOSES MANSIONS MARGOSAS
MARMOSES MASSICOT MASSOOLA MASTOIDS MAYORESS MESOSAUR MIASMOUS
MOBCASTS MOCASSIN MOLASSES MORASSES MOSASAUR MOSCATOS MOSSBACK
MOSSLAND MOUSAKAS MOUSSAKA NABOBESS NARCOSES NARCOSIS NAUSEOUS
NONCLASS NONPASTS NOSEBAGS NOSEGAYS NOWCASTS OAKINESS ODALISKS
ODYSSEAN OFFCASTS OILGASES OLESTRAS ONANISMS ONANISTS ONOMASTS
ONSTEADS OQUASSAS ORALISMS ORALISTS ORATRESS ORGIASTS OROPESAS
OSMIATES OSMUNDAS OSSARIUM OSSATURE OSSETRAS OSTEOMAS OSTMARKS
OUBAASES OUTCASTS OUTCLASS OUTFASTS OUTGASES OUTLASTS OUTSAILS
OUTSOARS OUTSPANS OUTSTAYS OUTTASKS OVALNESS OVERPASS OVERSEAS
OXALISES OXIDASES OXYSALTS PAESANOS PAISANOS PAPOOSES PARASOLS
PARISONS PASSADOS PASSBOOK PASSCODE PASSIONS PASSOUTS PASSOVER
PASSPORT PASSWORD PASTITSO PATHOSES PEASCODS PERSONAS PHAROSES
PLASMONS PODCASTS PODESTAS PORTASES POSAUNES POSTAGES POSTBAGS
POSTBASE POTASHES POTASSAS POTASSES POTASSIC POUSADAS PRESOAKS
PROSAISM PROSAIST PROSOMAS PROTASES PROTASIS PSAMMONS RASBORAS
REASSORT REPOSALS RESEASON RESPONSA ROADLESS ROASTERS ROASTIES
ROBUSTAS ROSACEAS ROSAKERS ROSALIAS ROSARIES ROSEBAYS ROSELLAS
ROSEOLAS ROTGRASS ROUSSEAU SABATONS SABAYONS SABULOSE SABULOUS
SACATONS SACCOSES SADIRONS SAFFRONS SAFROLES SAGOUINS SAGUAROS
SAHUAROS SAKKOSES SALAMONS SALCHOWS SALIGOTS SALTATOS SAMOVARS
SAMOYEDS SAMSHOOS SANDBOYS SANDHOGS SANDLOTS SANDSHOE SANDSOAP
SANGOMAS SANTEROS SANTOKUS SANTOORS SANTOURS SAOUARIS SAPAJOUS
SAPEGOES SAPONINS SAPOROUS SAPROBES SAPSAGOS SAPWOODS SARCODES
SARCOIDS SARCOMAS SARGASSO SARGOSES SARODIST SASSOLIN SASSWOOD
SAUROIDS SAUTOIRS SAVELOYS SAVIOURS SAVORERS SAVORIES SAVOROUS
SAWBONES SAWHORSE SAXHORNS SAXONIES SCABIOSA SCABIOUS SCABROUS
SCALADOS SCALLOPS SCANSION SCARIOSE SCARIOUS SCATOLES SCHOLARS
SCOPULAS SCOTOMAS SCREAMOS SEABOOTS SEACOAST SEACOCKS SEAFOAMS
SEAFOLKS SEAFOODS SEAFOWLS SEAHORSE SEAPORTS SEASCOUT SEASHORE
SEASONAL SEASONED SEASONER SEAWORMS SECALOSE SECONALS SENATORS
SENHORAS SENOPIAS SENSORIA SEPALOUS SEQUOIAS SEROVARS SERRANOS
SESAMOID SFUMATOS SHACKOES SHADOOFS SHAHDOMS SHAKUDOS SHALLONS
SHALLOPS SHALLOTS SHALLOWS SHAMOSIM SHAMPOOS SHATOOSH SHINOLAS
SHOALEST SHOEPACS SHOPHARS SHORTIAS SHOWCASE SICARIOS SIGNORAS
SINOPIAS SJAMBOKS SKATOLES SLAPSHOT SLIOTARS SNAPSHOT SNOTRAGS
SNOWCAPS SNOWCATS SOAKAGES SOAKINGS SOAPDISH SOAPFISH SOAPIEST
SOAPLESS SOAPSUDS SOARINGS SOCAGERS SOCCAGES SOCIATES SODALESS
SODALIST SOFABEDS SOILAGES SOLACERS SOLANINS SOLANUMS SOLARISE
SOLARISM SOLARIST SOLDADOS SOLVATES SOMATISM SOMATIST SOMEWAYS
SONANCES SONDAGES SOOTHSAY SOPRANOS SORBATES SOROBANS SOSATIES
SOULDANS SOUTANES SOUTHSAY SOWBACKS SOYBEANS SOYMEALS SPACIOUS
SPADONES SPAMBOTS SPAROIDS SPARROWS SPATHOSE SPORRANS SPOUSAGE
SPOUSALS SQUACCOS SQUALORS SQUAMOSE SQUAMOUS SQUARSON STALKOES
STANNOUS STANZOES STARDOMS STARNOSE STAROSTA STAROSTY STARSPOT
STASIMON STATIONS STOKESIA STOMACHS STOMACKS STOMATES STOPGAPS
STORAGES STORAXES STOWAGES STRATOSE STRATOUS SUASIONS SUBATOMS
SUBCOSTA SUBGOALS SUBSOLAR SUPPOSAL SURCOATS SWAGSHOP SWALLOWS
SWANSONG SYMPOSIA SYNAGOGS SYNANONS SYNODALS SYNOVIAS TEASHOPS
TOADLESS TOASTERS TOASTIES TOPMASTS TOPSAILS TORSADES TOSHACHS
TOSTADAS TOSTADOS TOWSACKS TRANSOMS TREASONS TSARDOMS TWASOMES
UNSEASON VAMOOSES VAVASORS VAVASSOR VODCASTS VOLUSPAS VOTARESS
WARISONS WASHOUTS WASHPOTS WAVESONS WAYPOSTS WOODSIAS ZAMOUSES
ZYMOSANS