There are 536 eleven-letter words containing A, N and 3S, https://www.bestwordlist.com/c/a/5/11letterwordswithansss.htm ABSCISSIONS ABSINTHISMS ABSTERSIONS ABUSIVENESS ACRIDNESSES ACUTENESSES ADDRESSINGS ADEPTNESSES ADULTNESSES ADVERSENESS ADVISEDNESS AGELESSNESS AGGRESSIONS AGILENESSES AIMLESSNESS AIRLESSNESS AIRSICKNESS ALERTNESSES ALGIDNESSES ALIENNESSES ALIKENESSES ALIVENESSES ALONENESSES ALOOFNESSES AMOROUSNESS AMPLENESSES AMUSINGNESS AMUSIVENESS ANAESTHESES ANAESTHESIS ANASTOMOSES ANASTOMOSIS ANCHORESSES ANESTHESIAS ANGRINESSES ANTECESSORS ANTISEXISTS ANTSINESSES ANXIOUSNESS APARTNESSES APERTNESSES APISHNESSES ARDUOUSNESS ARTLESSNESS ARTSINESSES ASHAMEDNESS ASKEWNESSES ASSAILMENTS ASSASSINATE ASSENTATORS ASSENTIENTS ASSESSMENTS ASSIGNMENTS ASSISTANCES ASSOILMENTS ASSORTMENTS ASSUMPTIONS ASSUREDNESS ASSYTHMENTS AUSTERENESS AWARENESSES AWELESSNESS AWESOMENESS AWFULNESSES BAGGINESSES BALKINESSES BALMINESSES BANDINESSES BARMINESSES BASHFULNESS BASSOONISTS BASTNASITES BATTINESSES BAWDINESSES BEADINESSES BEAMINESSES BEARISHNESS BEASTLINESS BENTGRASSES BLACKNESSES BLANDNESSES BLANKNESSES BLEAKNESSES BOARISHNESS BONNILASSES BRASHNESSES BRAVENESSES BROADNESSES BUSINESSMAN CADDISHNESS CAGEYNESSES CALLOUSNESS CAMPINESSES CANNINESSES CANTINESSES CANVASSINGS CARIOUSNESS CARNASSIALS CARSICKNESS CASSUMUNARS CATTINESSES CATTISHNESS CAUCUSSINGS CAUSTICNESS CHANTRESSES CHARINESSES CHEAPNESSES CIRCASSIANS CLEANNESSES CLEARNESSES COASSISTING COMPASSINGS COMPASSIONS CONFESSANTS CRANKNESSES CRASSNESSES CRAZINESSES CROSSANDRAS DAFFINESSES DAILINESSES DAILYNESSES DAMPISHNESS DASTARDNESS DATEDNESSES DAZEDNESSES DEACONESSES DEBASEDNESS DEGAUSSINGS DEPRESSANTS DESALINISES DESISTANCES DESSIATINES DESSYATINES DISCUSSANTS DISENSLAVES DISPASSIONS DISPERSANTS DISSONANCES DISSUASIONS DISTANTNESS DRAGONESSES DUNIWASSALS DWARFNESSES DYSKINESIAS EAGERNESSES EARLINESSES EARNESTNESS EASEFULNESS ECSTASISING ELASTICNESS ENCOMPASSES ENTHUSIASMS ENTHUSIASTS EQUALNESSES EVASIVENESS EXACTNESSES FADDINESSES FADDISHNESS FADEDNESSES FAINTNESSES FALSENESSES FANCINESSES FANTASISERS FASHIONISTS FATALNESSES FATTINESSES FATUOUSNESS FLAKINESSES FOAMINESSES FRAILNESSES FRANKNESSES FUSTIANISES FUSTIANISTS GABBINESSES GALLOWSNESS GAMEYNESSES GASEOUSNESS GASPINESSES GASSINESSES GAUDINESSES GAUNTNESSES GAUZINESSES GAWKINESSES GAWKISHNESS GHASTLINESS GHASTNESSES GLARINESSES GLAZINESSES GOATISHNESS GRANDNESSES GRAPINESSES GRAVENESSES GREATNESSES GYMNASIASTS HAGGISHNESS HAIRINESSES HAMMINESSES HANDGLASSES HANDINESSES HANDPRESSES HANSARDISES HAPLESSNESS HAPPINESSES HARASSMENTS HARDINESSES HARNESSLESS HARSHNESSES HASTINESSES HATLESSNESS HAWKISHNESS HEADINESSES HEAVINESSES HOARINESSES HUMANNESSES HUSBANDLESS ICONOSTASES ICONOSTASIS IDEALNESSES INANENESSES INAPTNESSES INCRASSATES INSESSORIAL INSPISSATED INSPISSATES INSPISSATOR INSTANTNESS INSULARISMS INSULINASES IRATENESSES ISINGLASSES JADEDNESSES JANISSARIES JANITRESSES JAZZINESSES JEALOUSNESS JOUISSANCES KNAVISHNESS KNOTGRASSES LADDISHNESS LANKINESSES LARGENESSES LARKINESSES LARKISHNESS LASTINGNESS LAUNDRESSES LAWLESSNESS LEAFINESSES LEAKINESSES LEARINESSES LESBIANISMS LOAMINESSES LOATHNESSES LOCALNESSES LOSABLENESS LOYALNESSES MAIDISHNESS MALTINESSES MANGINESSES MANLINESSES MANNISHNESS MASSINESSES MASSIVENESS MATEYNESSES MAWKISHNESS MAZEDNESSES MEALINESSES MEATINESSES MESSIANISMS MISANALYSES MISANALYSIS MISANDRISTS MISASSAYING MISASSIGNED MISASSUMING MISBIASSING MISCLASSING MUSICALNESS NAIVENESSES NAKEDNESSES NANOGRASSES NAPPINESSES NARCISSISMS NARCISSISTS NARCISSUSES NASTINESSES NATTINESSES NECESSAIRES NECESSARIES NEWSCASTERS NEWSFLASHES NONPASSIVES NOSTALGISTS NYSTAGMUSES OBSESSIONAL OUTGASSINGS OUTPASSIONS PAINTRESSES PANCOSMISMS PANDERESSES PANSOPHISMS PANSOPHISTS PANTDRESSES PARLOUSNESS PASSIONATES PASSIONLESS PASSIVENESS PASTINESSES PATRONESSES PAWKINESSES PEAKINESSES PEARTNESSES PERSUASIONS PIANISSIMOS PLAINNESSES PLANENESSES POSTSEASONS PROSAICNESS PRUSSIANISE PUISSAUNCES QUAKINESSES RABIDNESSES RAFFISHNESS RAININESSES RAMMISHNESS RANDINESSES RANGINESSES RAPIDNESSES RASPINESSES RATTINESSES RAUCOUSNESS RAYLESSNESS READINESSES REASSESSING REGALNESSES RESISTANCES RURALNESSES SAINTLINESS SALABLENESS SALESPERSON SALMANASERS SALSUGINOUS SALTINESSES SALTISHNESS SAMEYNESSES SANDCASTLES SANDGLASSES SANDGROUSES SANDINESSES SANDSUCKERS SANGIOVESES SANITARISTS SANSEVERIAS SAPIDNESSES SAPLESSNESS SAPPINESSES SARKINESSES SASSINESSES SATEDNESSES SAUCINESSES SAVABLENESS SAVOURINESS SAVVINESSES SCABBEDNESS SCALINESSES SCANDALISES SCANTNESSES SCARINESSES SCHALSTEINS SCINTISCANS SCRAGGINESS SCRAPPINESS SCRAWNINESS SCREENCASTS SCRIMSHANKS SEAMANSHIPS SEAMINESSES SEASICKNESS SECESSIONAL SEISMONASTY SEMINARISTS SENSUALISED SENSUALISES SENSUALISMS SENSUALISTS SENSUALIZES SENSUALNESS SERVANTLESS SESSIONALLY SHADINESSES SHADOWINESS SHAGGEDNESS SHAKINESSES SHALLOWNESS SHAPELINESS SHARPNESSES SHEEPSHANKS SHINKANSENS SHOALNESSES SINARCHISMS SINARCHISTS SINARQUISMS SINARQUISTS SINSEMILLAS SIZABLENESS SKRIMSHANKS SLACKNESSES SLATINESSES SLAVISHNESS SLIMNASTICS SMALLNESSES SMARTNESSES SNAILFISHES SNAKEFISHES SNAKESTONES SNAKINESSES SNAKISHNESS SOAPINESSES SOUNDSCAPES SOUNDSTAGES SOUSAPHONES SPACINESSES SPANIOLISES SPARENESSES SPARINGNESS SPECIALNESS SPESSARTINE SPINCASTERS SPINMASTERS SPLASHDOWNS SPLASHINESS SQUALIDNESS SQUASHINESS SQUATNESSES SQUATTINESS SQUEAKINESS STAGINESSES STAIDNESSES STAINLESSES STAINLESSLY STALENESSES STANDFIRSTS STANDSTILLS STARCHINESS STARKNESSES STATELINESS STAUNCHLESS STAUNCHNESS STEENBRASES STOICALNESS STONEMASONS STONEWASHES STRANGENESS STREAKINESS STREAMINESS SUASIVENESS SUAVENESSES SUBACIDNESS SUBCLASSING SUBSTATIONS SUFFISANCES SULTANESSES SULTANSHIPS SUMMARINESS SUPPRESSANT SUSPENSORIA SUSTAININGS SUSTENANCES SUSTENTATES SWARTHINESS SWARTNESSES SYNANTHESES SYNANTHESIS SYNESTHESIA SYNSEPALOUS SYNTHETASES TACITNESSES TACKINESSES TALKINESSES TANGINESSES TAPERNESSES TARANTASSES TARDINESSES TARRINESSES TARTINESSES TASSELLINGS TASTINESSES TATTINESSES TAWNINESSES TEARINESSES THALASSIANS TRANSFUSERS TRANSISTORS TRANSPOSALS TRANSPOSERS TRANSPOSONS TRANSSHAPES TRANSVERSES TRESPASSING TSESAREVNAS TYRANNESSES TYROSINASES UNAPTNESSES UNASSISTING UNBIASSINGS UNCLASSIEST UNDERPASSES UNHARNESSES UNSHARPNESS UNSTAIDNESS UNSURPASSED UNUSUALNESS USEABLENESS USUALNESSES VACUOUSNESS VAGUENESSES VALIDNESSES VANTBRASSES VAPIDNESSES VARIOUSNESS VASOPRESSIN VASSALISING VERNISSAGES VITALNESSES VOCALNESSES WACKINESSES WAGGISHNESS WASHINESSES WASPINESSES WASPISHNESS WASSAILINGS WASTENESSES WEAKISHNESS WEARINESSES WINEGLASSES WOMANNESSES ZEALOUSNESS