There are 953 eleven-letter words containing A and 3S, https://www.bestwordlist.com/c/a/4/11letterwordswithasss.htm ABSCISSIONS ABSINTHISMS ABSOLUTISES ABSOLUTISMS ABSOLUTISTS ABSTERSIONS ABSTERSIVES ABUSIVENESS ACCESSARIES ACCESSORIES ACCESSORISE ACCESSORIUS ACRIDNESSES ACTRESSIEST ACUTENESSES ADDRESSINGS ADEPTNESSES ADULTNESSES ADULTRESSES ADVERSENESS ADVISEDNESS AEROSOLISES AGELESSNESS AGGRESSIONS AGILENESSES AIMLESSNESS AIRLESSNESS AIRSICKNESS ALBATROSSES ALERTNESSES ALGIDNESSES ALIENNESSES ALIKENESSES ALIVENESSES ALONENESSES ALOOFNESSES AMBASSADORS AMOROUSNESS AMPLENESSES AMUSINGNESS AMUSIVENESS ANAESTHESES ANAESTHESIS ANASTOMOSES ANASTOMOSIS ANCHORESSES ANESTHESIAS ANGRINESSES ANTECESSORS ANTISEXISTS ANTSINESSES ANXIOUSNESS APARTNESSES APERTNESSES APISHNESSES APOSIOPESES APOSIOPESIS APOSTATISES APOSTOLISES ARBITRESSES ARCHERESSES ARDUOUSNESS ARTLESSNESS ARTSINESSES ASCETICISMS ASCLEPIASES ASEPTICISES ASEPTICISMS ASHAMEDNESS ASKEWNESSES ASPARAGUSES ASPERSORIES ASPIDISTRAS ASSAFETIDAS ASSAILMENTS ASSASSINATE ASSEMBLAGES ASSENTATORS ASSENTIENTS ASSESSMENTS ASSESSORIAL ASSEVERATES ASSIBILATES ASSIDUITIES ASSIDUOUSLY ASSIGNMENTS ASSIMILATES ASSISTANCES ASSOCIATORS ASSOILMENTS ASSORTMENTS ASSUMPTIONS ASSUREDNESS ASSYTHMENTS ASTATICISMS ASYSTOLISMS AUDITRESSES AUSTERENESS AUTHORESSES AUTOCROSSES AVIATRESSES AWARENESSES AWELESSNESS AWESOMENESS AWFULNESSES BABIROUSSAS BACKCROSSES BACKSHISHES BACKSLASHES BAGGINESSES BAKHSHISHES BAKSHEESHES BALKINESSES BALMINESSES BANDINESSES BARMINESSES BASHAWSHIPS BASHFULNESS BASSOONISTS BASTARDISES BASTARDISMS BASTNASITES BATTINESSES BAWDINESSES BEADINESSES BEAMINESSES BEARGRASSES BEARISHNESS BEASTLINESS BENTGRASSES BESTIALISES BESTIALISMS BLACKNESSES BLANDNESSES BLANKNESSES BLASTOCYSTS BLASTODISCS BLEAKNESSES BLUEGRASSES BOARISHNESS BONNILASSES BRADYSEISMS BRASHNESSES BRAVENESSES BROADNESSES BURSARSHIPS BUSHMASTERS BUSINESSMAN CADDISHNESS CAGEYNESSES CALLOUSNESS CAMPINESSES CANNINESSES CANTINESSES CANVASSINGS CARIOUSNESS CARNASSIALS CARSICKNESS CASSOLETTES CASSOWARIES CASSUMUNARS CASUISTRIES CATTINESSES CATTISHNESS CAUCUSSINGS CAUSELESSLY CAUSTICNESS CEASELESSLY CHANTRESSES CHAPRASSIES CHARINESSES CHEAPNESSES CHESSBOARDS CHOLESTASES CHOLESTASIS CHRYSALISES CHUPRASSIES CIRCASSIANS CLASSICISED CLASSICISES CLASSICISMS CLASSICISTS CLASSICIZES CLASSIFIEDS CLASSIFIERS CLEANNESSES CLEARNESSES COASSISTING COATDRESSES COMPASSINGS COMPASSIONS CONFESSANTS CORDGRASSES CRABGRASSES CRANKNESSES CRASSITUDES CRASSNESSES CRAZINESSES CREATRESSES CROSSANDRAS CROSSCLAIMS CRYSTALISES CUIRASSIERS DAFFINESSES DAILINESSES DAILYNESSES DAMPISHNESS DASTARDNESS DATEDNESSES DAZEDNESSES DEACONESSES DEBARRASSES DEBASEDNESS DEERGRASSES DEGAUSSINGS DEPRESSANTS DESALINISES DESISTANCES DESSIATINES DESSYATINES DIASKEUASTS DIASPORISTS DISASSEMBLE DISASSEMBLY DISCUSSABLE DISCUSSANTS DISENSLAVES DISHWASHERS DISPASSIONS DISPERSANTS DISPOSABLES DISPRAISERS DISSERTATES DISSHEATHES DISSIMILARS DISSIPATERS DISSIPATORS DISSOCIATES DISSONANCES DISSUASIONS DISSUASIVES DISTANTNESS DRAGONESSES DRESSGUARDS DRESSMAKERS DUNIWASSALS DWARFNESSES DYSCRASITES DYSKINESIAS EAGERNESSES EARLINESSES EARNESTNESS EASEFULNESS ECBLASTESES ECBLASTESIS ECCLESIASTS ECSTASISING ELASMOSAURS ELASTICISES ELASTICNESS EMBARRASSES EMBASSADORS ENCOMPASSES ENTHUSIASMS ENTHUSIASTS EPISPASTICS EPISTAXISES EQUALNESSES ESEMPLASIES ESOPHAGUSES ESTABLISHES EVASIVENESS EXACTNESSES EXACTRESSES EXHAUSTLESS EXPRESSAGES EXPRESSWAYS FADDINESSES FADDISHNESS FADEDNESSES FAINTNESSES FALSENESSES FANCINESSES FANTASISERS FARMERESSES FASCIITISES FASHIONISTS FATALNESSES FATTINESSES FATUOUSNESS FISSIPARISM FISSIPAROUS FLAKINESSES FOAMINESSES FRAILNESSES FRANKNESSES FUSTIANISES FUSTIANISTS GABBINESSES GALLOWSNESS GAMEYNESSES GAOLERESSES GASEOUSNESS GASPINESSES GASSINESSES GASTRITISES GASTROSOPHS GAUDINESSES GAUNTNESSES GAUSSMETERS GAUZINESSES GAWKINESSES GAWKISHNESS GESTALTISMS GESTALTISTS GHASTLINESS GHASTNESSES GLARINESSES GLASSCLOTHS GLASSHOUSES GLASSMAKERS GLASSPAPERS GLAZINESSES GLOSSARISTS GOATISHNESS GRANDNESSES GRAPINESSES GRASSCLOTHS GRASSCYCLES GRASSWRACKS GRAVENESSES GREATNESSES GYMNASIASTS HAEMOSTASES HAEMOSTASIS HAGGISHNESS HAIRINESSES HAMMINESSES HANDGLASSES HANDINESSES HANDPRESSES HANSARDISES HAPLESSNESS HAPPINESSES HARASSMENTS HARDGRASSES HARDINESSES HARNESSLESS HARSHNESSES HARVESTLESS HASSOCKIEST HASTINESSES HATLESSNESS HAWKISHNESS HEADDRESSES HEADINESSES HEARTSEASES HEAVINESSES HEMOSTASIAS HISTOBLASTS HOARINESSES HOMEOSTASES HOMEOSTASIS HOURGLASSES HUMANNESSES HUSBANDLESS HYDRASTISES HYPOSTASISE ICONOSTASES ICONOSTASIS IDEALNESSES INANENESSES INAPTNESSES INCRASSATES INSESSORIAL INSPISSATED INSPISSATES INSPISSATOR INSTANTNESS INSULARISMS INSULINASES IRATENESSES ISINGLASSES ISOSEISMALS JADEDNESSES JAILERESSES JAILORESSES JANISSARIES JANITRESSES JAZZINESSES JEALOUSNESS JOUISSANCES KAISERSHIPS KICKSHAWSES KILOGAUSSES KNAVISHNESS KNOTGRASSES LADDISHNESS LANKINESSES LARGENESSES LARKINESSES LARKISHNESS LASTINGNESS LAUNDRESSES LAWLESSNESS LEAFINESSES LEAKINESSES LEARINESSES LESBIANISMS LOAMINESSES LOATHNESSES LOCALNESSES LOSABLENESS LOYALNESSES MAIDISHNESS MALTINESSES MANGINESSES MANLINESSES MANNISHNESS MASSASAUGAS MASSINESSES MASSIVENESS MASSPRIESTS MASTERCLASS MASTERSHIPS MATELLASSES MATEYNESSES MAWKISHNESS MAXIDRESSES MAZEDNESSES MEALINESSES MEASURELESS MEATINESSES MEGAGAUSSES MESOSCAPHES MESSIAHSHIP MESSIANISMS METASTASISE MISANALYSES MISANALYSIS MISANDRISTS MISASSAYING MISASSEMBLE MISASSIGNED MISASSUMING MISBIASSING MISCLASSIFY MISCLASSING MISEMPHASES MISEMPHASIS MISMEASURES MISOGAMISTS MISSALETTES MUSICALISES MUSICALNESS MUTESSARIFS NAIVENESSES NAKEDNESSES NANOGRASSES NAPPINESSES NARCISSISMS NARCISSISTS NARCISSUSES NASTINESSES NATTINESSES NECESSAIRES NECESSARIES NEWSCASTERS NEWSFLASHES NONPASSIVES NOSTALGISTS NYSTAGMUSES OBSESSIONAL OSTEOBLASTS OSTEOCLASES OSTEOCLASIS OSTEOCLASTS OSTRACISERS OUTGASSINGS OUTPASSIONS OVERASSERTS OVERCLASSES OVERGRASSES PAINTRESSES PALIMPSESTS PANCOSMISMS PANDERESSES PANSOPHISMS PANSOPHISTS PANTDRESSES PARASITISES PARASITISMS PARASITOSES PARASITOSIS PARLOUSNESS PASSAGEWAYS PASSAMEZZOS PASSIFLORAS PASSIMETERS PASSIONATES PASSIONLESS PASSIVENESS PASSIVITIES PASTELLISTS PASTEURISES PASTEURISMS PASTINESSES PASTORSHIPS PASTURELESS PATISSERIES PATRONESSES PAUPERESSES PAUSELESSLY PAWKINESSES PEAKINESSES PEARTNESSES PERISTALSES PERISTALSIS PERSUASIONS PERSUASIVES PETRISSAGES PHARISAISMS PIANISSIMOS PIPSISSEWAS PISSASPHALT PLAINNESSES PLANENESSES PLASMODESMS PLASMOLYSES PLASMOLYSIS PLASMOSOMES PLASTICISES PLESIOSAURS PLUMASSIERS POSSESSABLE POSTCLASSIC POSTMASTERS POSTSEASONS PREFASCISTS PRELATESSES PRESSBOARDS PROLAPSUSES PROSAICISMS PROSAICNESS PROSTATISMS PRUSSIANISE PSALMODISES PSALMODISTS PSALTRESSES PSITTACOSES PSITTACOSIS PSYCHOGASES PUISSAUNCES QUAKINESSES RABIDNESSES RAFFISHNESS RAININESSES RAMMISHNESS RANDINESSES RANGINESSES RAPIDNESSES RASPINESSES RATTINESSES RAUCOUSNESS RAYLESSNESS READDRESSES READINESSES REASSEMBLES REASSESSING REGALNESSES REPOUSSAGES RESISTANCES RHAPSODISES RHAPSODISTS RICEGRASSES RURALNESSES SABLEFISHES SACAHUISTAS SACAHUISTES SACCHARASES SACCHARISES SACCHAROSES SACHEMSHIPS SAGEBRUSHES SAINTLINESS SALABLENESS SALERATUSES SALESCLERKS SALESLADIES SALESPERSON SALICYLISMS SALMANASERS SALSUGINOUS SALTINESSES SALTISHNESS SALTSHAKERS SAMARSKITES SAMEYNESSES SANDCASTLES SANDGLASSES SANDGROUSES SANDINESSES SANDSUCKERS SANGIOVESES SANITARISTS SANSEVERIAS SAPIDNESSES SAPLESSNESS SAPPINESSES SARCOCYSTIS SARCOIDOSES SARCOIDOSIS SARCOPLASMS SARKINESSES SARTORIUSES SASQUATCHES SASSAFRASES SASSINESSES SATEDNESSES SATISFICERS SAUCINESSES SAUSSURITES SAUSSURITIC SAVABLENESS SAVOURINESS SAVVINESSES SAWDUSTIEST SCABBEDNESS SCALDFISHES SCALINESSES SCANDALISES SCANTNESSES SCARINESSES SCHALSTEINS SCHEMATISES SCHEMATISMS SCHEMATISTS SCHISMATICS SCHISMATISE SCHOLASTICS SCINTISCANS SCISSORTAIL SCRAGGINESS SCRAPPINESS SCRATCHLESS SCRAWNINESS SCREENCASTS SCRIMSHANKS SEAMANSHIPS SEAMINESSES SEAMSTRESSY SEASICKNESS SECESSIONAL SECULARISES SECULARISMS SECULARISTS SEISMOGRAMS SEISMONASTY SEMICLASSIC SEMINARISTS SEMIPOSTALS SENSUALISED SENSUALISES SENSUALISMS SENSUALISTS SENSUALIZES SENSUALNESS SEPARATISMS SEPARATISTS SERRASALMOS SERVANTLESS SESSIONALLY SEXTARIUSES SHADINESSES SHADOWCASTS SHADOWINESS SHAGGEDNESS SHAHTOOSHES SHAKINESSES SHALLOWNESS SHAMELESSLY SHAPELESSLY SHAPELINESS SHARPNESSES SHEATFISHES SHEEPSHANKS SHEEPSHEADS SHERARDISES SHINKANSENS SHIPMASTERS SHIRTWAISTS SHOALNESSES SHOCKSTALLS SIDEROSTATS SIDESADDLES SINARCHISMS SINARCHISTS SINARQUISMS SINARQUISTS SINSEMILLAS SIZABLENESS SKIASCOPIES SKRIMSHANKS SKYSCRAPERS SLACKNESSES SLACTIVISMS SLACTIVISTS SLAISTERIES SLATINESSES SLAVISHNESS SLIMNASTICS SLIPSTREAMS SMALLNESSES SMALLSWORDS SMARTNESSES SMOKESTACKS SNAILFISHES SNAKEFISHES SNAKESTONES SNAKINESSES SNAKISHNESS SOAPINESSES SOAPSUDSIER SOCIALISERS SOLIDARISMS SOLIDARISTS SOMERSAULTS SOMESTHESIA SOOTHSAYERS SOUNDSCAPES SOUNDSTAGES SOUSAPHONES SPACINESSES SPADEFISHES SPANIOLISES SPARENESSES SPARINGNESS SPARKLESSLY SPASMODISTS SPATIALISES SPEAKEASIES SPEARFISHES SPECIALISES SPECIALISMS SPECIALISTS SPECIALNESS SPECTATRESS SPESSARTINE SPESSARTITE SPHACELUSES SPINCASTERS SPINMASTERS SPIRALISERS SPLASHBACKS SPLASHDOWNS SPLASHINESS SPOKESHAVES SPORTSCASTS SPORTSWEARS SQUABASHERS SQUADOOSHES SQUALIDNESS SQUASHINESS SQUATNESSES SQUATTINESS SQUAWBUSHES SQUAWFISHES SQUEAKINESS STABILISERS STAGINESSES STAIDNESSES STAINLESSES STAINLESSLY STALENESSES STANDFIRSTS STANDSTILLS STAPEDIUSES STARCHINESS STARKNESSES STATEHOUSES STATELINESS STATOBLASTS STATOSCOPES STAUNCHLESS STAUNCHNESS STAVESACRES STEAKHOUSES STEARSMATES STEATOLYSES STEATOLYSIS STEENBRASES STEERSMATES STEGOSAURUS STIBIALISMS STIGMATISES STIGMATISMS STIGMATISTS STOICALNESS STOMACHLESS STONEMASONS STONEWASHES STRANGENESS STRAPLESSES STRATEGISES STRATEGISTS STRATHSPEYS STREAKINESS STREAMINESS STREAMSIDES STRIPTEASES SUASIVENESS SUAVENESSES SUBACIDNESS SUBASSEMBLE SUBASSEMBLY SUBCLASSIFY SUBCLASSING SUBSTATIONS SUBSTRATUMS SUBSURFACES SUCCESSORAL SUCCOTASHES SUCCURSALES SUFFISANCES SUFFRAGISMS SUFFRAGISTS SUGARBUSHES SUGARHOUSES SULPHATASES SULTANESSES SULTANSHIPS SUMMARINESS SUMMARISERS SUPERSAVERS SUPERSCALES SUPERSEDEAS SUPERSTATES SUPERVISALS SUPPRESSANT SURFACELESS SURFCASTERS SURPASSABLE SURPLUSAGES SURREALISMS SURREALISTS SUSPENSORIA SUSTAININGS SUSTENANCES SUSTENTATES SWARTHINESS SWARTNESSES SWEATSHIRTS SWEEPSTAKES SWITCHGRASS SYBARITISMS SYMPATHISES SYMPOSIASTS SYNANTHESES SYNANTHESIS SYNESTHESIA SYNSEPALOUS SYNTHETASES SYSSARCOSES SYSSARCOSIS SYSSARCOTIC SYSTEMATICS SYSTEMATISE SYSTEMATISM SYSTEMATIST TACITNESSES TACKINESSES TAILORESSES TALKINESSES TALLGRASSES TANGINESSES TAPERNESSES TAPSTRESSES TARANTASSES TARDINESSES TARRINESSES TARTINESSES TASKMASTERS TASSELLIEST TASSELLINGS TASTELESSLY TASTINESSES TATTINESSES TAWNINESSES TEARINESSES TESSELLATES THALASSIANS THESAURUSES TICKLEASSES TOADGRASSES TRAITRESSES TRANSFUSERS TRANSISTORS TRANSPOSALS TRANSPOSERS TRANSPOSONS TRANSSHAPES TRANSVERSES TRESPASSERS TRESPASSING TSESAREVNAS TSOTSITAALS TURFGRASSES TYRANNESSES TYROSINASES UNAPTNESSES UNASSISTING UNBIASSINGS UNCLASSIEST UNDERPASSES UNHARNESSES UNSHARPNESS UNSTAIDNESS UNSURPASSED UNUSUALNESS USEABLENESS USUALNESSES VACUOUSNESS VAGUENESSES VALIDNESSES VANTBRASSES VAPIDNESSES VARIOUSNESS VARLETESSES VASOPRESSIN VASOPRESSOR VASOSPASTIC VASSALESSES VASSALISING VERNISSAGES VISUALISERS VITALNESSES VOCALNESSES WACKINESSES WAGGISHNESS WASHINESSES WASPINESSES WASPISHNESS WASSAILINGS WASSAILRIES WASTENESSES WATERBUSSES WEAKISHNESS WEARINESSES WHITEBASSES WINEGLASSES WIREGRASSES WOMANNESSES ZEALOUSNESS