There are 474 twelve-letter words containing A, D, N and 2S, https://www.bestwordlist.com/c/a/5/12letterwordswithadnss.htm
ABSCONDENCES ABSURDNESSES ACCURSEDNESS ADAPTIVENESS ADDICTEDNESS
ADENOVIRUSES ADEQUATENESS ADHESIVENESS ADOLESCENCES ADOPTIANISMS
ADOPTIANISTS ADOPTIONISMS ADOPTIONISTS ADORABLENESS ADROITNESSES
ADSCRIPTIONS ADULTESCENTS ADVENTURISMS ADVENTURISTS ADVERTISINGS
AFFECTEDNESS AGGRANDISERS ALDOPENTOSES ALDOSTERONES ALEXANDERSES
AMAZEDNESSES ANDROGENESES ANDROGENESIS ANDROLOGISTS ANESTHETISED
ANISODACTYLS ANODISATIONS ANTIADITISES ARABINOSIDES ASCENDANCIES
ASCENDENCIES ASSASSINATED ASSORTEDNESS ASTEROIDEANS ASTOUNDMENTS
ASTRONOMISED BACKSLIDINGS BACKWARDNESS BASTARDISING BIDDABLENESS
BLADDERNOSES BONDMANSHIPS BONDSERVANTS BOUNDARYLESS BRASSFOUNDER
CALENDARISES CALENDARISTS CANDESCENCES CANDIDNESSES CANDLEFISHES
CANDLESTICKS CANDYFLOSSES CANISTERISED CANKEREDNESS CLADOGENESES
CLADOGENESIS COMPASSIONED CONSOLIDATES CONTREDANSES COTRANSDUCES
COWARDLINESS CRESCENTADES CROSSBANDING CUSPIDATIONS DAINTINESSES
DAMASCENINGS DAMNABLENESS DAPPERNESSES DARINGNESSES DAUPHINESSES
DEACCESSIONS DEADLINESSES DEBARRASSING DEBONAIRNESS DECARBONISES
DECUSSATIONS DEFENSATIVES DEGUSTATIONS DELASSEMENTS DELICATENESS
DELICATESSEN DEMAGNETISES DEMIBASTIONS DEMONIACISMS DEMONIANISMS
DEMONSTRATES DEPRAVEDNESS DESAGREMENTS DESALINATORS DESALINISING
DESANCTIFIES DESCENSIONAL DESECRATIONS DESICCATIONS DESIGNATIONS
DESIPRAMINES DESOLATENESS DESPERATIONS DESPUMATIONS DESTINATIONS
DETACHEDNESS DETAILEDNESS DETASSELLING DETESTATIONS DEVASTATIONS
DIACHRONISMS DIAGONALISES DIALYSATIONS DIATESSARONS DIATONICISMS
DIGRESSIONAL DILATORINESS DIPSOMANIACS DISABLEMENTS DISAMENITIES
DISANALOGIES DISANALOGOUS DISANNULLERS DISARMAMENTS DISAVENTROUS
DISAVENTURES DISBANDMENTS DISCANDYINGS DISCARDMENTS DISCOMEDUSAN
DISCONSOLATE DISCOPHORANS DISCORDANCES DISCREPANCES DISCUSSIONAL
DISEASEDNESS DISENSLAVING DISENTANGLES DISENTHRALLS DISENTRANCES
DISENTRAYLES DISFRANCHISE DISGARNISHED DISGARNISHES DISGARRISONS
DISHARMONIES DISHARMONISE DISHWASHINGS DISINFESTANT DISLOCATIONS
DISMALNESSES DISMANTLINGS DISMASTMENTS DISMAYEDNESS DISMUTATIONS
DISORGANISED DISORGANISER DISORGANISES DISORGANIZES DISPENSARIES
DISPENSATION DISPENSATIVE DISPENSATORS DISPENSATORY DISPLEASANCE
DISPLEASANTS DISPUTATIONS DISRELATIONS DISSEMBLANCE DISSEMINATED
DISSEMINATES DISSEMINATOR DISSERTATING DISSERTATION DISSEVERANCE
DISSHEATHING DISSIPATIONS DISSOCIATING DISSOCIATION DISSONANCIES
DISTANCELESS DISTRACTIONS DISTRINGASES DISTURBANCES DOCKISATIONS
DOWNSTAIRSES DOWNWARDNESS DRABBINESSES DRACONTIASES DRACONTIASIS
DRAFTINESSES DRAFTSPERSON DRAGONFISHES DRAUGHTINESS DRAWLINGNESS
DREADFULNESS DREAMFULNESS DREAMINESSES DREARINESSES DRESSMAKINGS
DUNIEWASSALS DUNNIEWASSAL DWARFISHNESS DYNASTICISMS DYSPAREUNIAS
DYSSYNERGIAS EDACIOUSNESS EDUCATEDNESS ELATEDNESSES ENDORSATIONS
ENLARGEDNESS EUDAEMONISMS EUDAEMONISTS EUDAIMONISMS EUDAIMONISTS
EVERYDAYNESS FANTASYLANDS FAVOUREDNESS FINASTERIDES FUNDRAISINGS
GANGLIOSIDES GANGSTERDOMS GASTROPODANS GLADSOMENESS GLOSSODYNIAS
GORMANDISERS GOURMANDISES GOURMANDISMS GRADABLENESS GRANDEESHIPS
GRANDMASTERS GRAVIDNESSES GROUNDMASSES GROUNDSHARES HAIRDRESSING
HALLOWEDNESS HAMPEREDNESS HANDEDNESSES HANDFASTINGS HANDSHAKINGS
HANDSOMENESS HANDYPERSONS HANSARDISING HARDINGGRASS HEADLESSNESS
HEATEDNESSES HISPANICISED HOLLANDAISES HOUSEHUSBAND HUSBANDLANDS
HUSBANDLIEST HYDROGENASES ICOSAHEDRONS IDIOSYNCRASY IDOLISATIONS
INADMISSIBLE INADMISSIBLY INDORSATIONS INFLATEDNESS INTERSTRANDS
INWARDNESSES IRIDISATIONS JADISHNESSES JAGGEDNESSES LABOUREDNESS
LADYLIKENESS LANDLESSNESS LANDLORDISMS LANDSCAPINGS LANDSCAPISTS
LANDSKNECHTS LAUDABLENESS LEADENNESSES LEOPARDSKINS LOADSAMONEYS
LOADSAMONIES MAIDENLINESS MAIDSERVANTS MAIMEDNESSES MANDARINISMS
MANDOLINISTS MANIFOLDNESS MANSPREADERS MARKEDNESSES MARSHLANDERS
MASCULINISED MASSARANDUBA MASSERANDUBA MEASUREDNESS MERCHANDISES
MIDDENSTEADS MISADJUSTING MISDEMEANORS MISDIAGNOSED MISDIAGNOSES
MISDIAGNOSIS MISGUIDANCES MISHANDLINGS MISPLEADINGS MISTREADINGS
MODERATENESS NECESSITATED NONADMISSION NONSTANDARDS NURSERYMAIDS
OBDURATENESS ODONTOBLASTS ORDINARINESS OUTDATEDNESS OUTDISTANCES
OUTPASSIONED OXIDISATIONS PACHYSANDRAS PAEDOGENESES PAEDOGENESIS
PALLIDNESSES PAMPEREDNESS PARASCENDERS PASQUINADERS PASTURELANDS
PEAKEDNESSES PEDANTICISES PEDANTICISMS PERSONALISED PLACIDNESSES
PREADMISSION PREPAREDNESS PRUSSIANISED PRUSSIANIZED PSALMODISING
PSEUDOMONADS QUADRASONICS RAGGEDNESSES RANCIDNESSES RANDOMNESSES
READABLENESS READDRESSING READMISSIONS RELANDSCAPES RETRANSFUSED
RHAPSODISING RIDESHARINGS SACREDNESSES SALMAGUNDIES SANCTUARISED
SANDBLASTERS SANDBLASTING SANDCHERRIES SANDERSWOODS SAPINDACEOUS
SARDONICISMS SAUROPSIDANS SCAFFOLDINGS SCANDALISERS SCANDALISING
SCANDALIZERS SCANDALOUSLY SCINCOIDIANS SCINDAPSUSES SCOLOPENDRAS
SCORPAENOIDS SCRAGGEDNESS SCRIMSHANDER SCRIMSHANKED SEAREDNESSES
SEDATENESSES SEMIDARKNESS SERVANTHOODS SHARPBENDERS SHERARDISING
SHOOTAROUNDS SIDEROPENIAS SINGULARISED SINUSOIDALLY SKRIMSHANKED
SLANDEROUSLY SLUGGARDNESS SLUMBERLANDS SNOWBLADINGS SNOWBOARDERS
SOMATOMEDINS SOUTHLANDERS SPEEDSKATING SPODOMANCIES SPRINGBOARDS
SQUANDERINGS STADDLESTONE STANDARDISED STANDARDISER STANDARDISES
STANDARDIZES STANDARDLESS STANDPATTERS STANDPATTISM STAPHYLINIDS
STARCHEDNESS STEADINESSES STEDFASTNESS STELLERIDANS STENOCARDIAS
STEPDANCINGS STICKHANDLES STIPENDIATES STRANDEDNESS STRANDWOLVES
STRIDULANCES STRINGBOARDS STUDDINGSAIL SUBAUDITIONS SUBCARDINALS
SUBDEANERIES SUBDOMINANTS SUBINDICATES SUBMANIFOLDS SUBORDINATES
SUBSTANDARDS SUBURBANISED SUCCEDANEOUS SUCCEDANEUMS SULFADOXINES
SULFONAMIDES SUPERABOUNDS SUPERHARDENS SURADDITIONS SURTARBRANDS
SURTURBRANDS SYNDACTYLIES SYNDACTYLISM SYNDACTYLOUS SYNDICALISMS
SYNDICALISTS SYNDICATIONS TAWDRINESSES TOWARDLINESS TOWARDNESSES
TRADESPERSON TRANSDUCTORS TRANSGENDERS TRANSGRESSED TRANSPONDERS
TRANSPONDORS TRANSSHIPPED UNASSISTEDLY UNASSOCIATED UNBIASEDNESS
UNCANDIDNESS UNCLASSIFIED UNDERCLASSES UNDERPASSION UNDERPRAISES
UNDESIRABLES UNEMPHASISED UNFADINGNESS UNFASTIDIOUS UNFEUDALISES
UNSOCIALISED UNSTEADINESS UNTOWARDNESS UNWASHEDNESS UPWARDNESSES
VAGABONDISES VAGABONDISMS VANGUARDISMS VANGUARDISTS VARIEDNESSES
VINDICATRESS VINEYARDISTS VOIDABLENESS WALDSTERBENS WENSLEYDALES
WHISKERANDOS WINDLESTRAES WINDLESTRAWS WITHSTANDERS