There are 438 fourteen-letter words containing A, O and 3S, https://www.bestwordlist.com/c/a/5/14letterwordswithaosss.htm ABORTIVENESSES ABSOLUTENESSES ABSORPTIVENESS ABSTEMIOUSNESS ABSTENTIONISMS ABSTENTIONISTS ACCUSTOMEDNESS ADORABLENESSES AGROBUSINESSES AGROSTOLOGISTS ALDOSTERONISMS AMBASSADORSHIP AMPHIBIOUSNESS ANARTHROUSNESS ANKYLOSAURUSES ANTISOCIALISMS ANTISOCIALISTS ANTISPASMODICS APPOSITENESSES ARISTOCRATISMS ASSASSINATIONS ASSOCIATESHIPS ASSOCIATIONISM ASSOCIATIONIST ASSORTEDNESSES ASTHENOSPHERES ASTROCOMPASSES ASTROPHYSICIST AUDIOCASSETTES AUSPICIOUSNESS AUTOSCHEDIASMS AVARICIOUSNESS AVOWABLENESSES BACTERIOSTASES BACTERIOSTASIS BALLISTOSPORES BASIDIOSPOROUS BIOSYSTEMATICS BIOSYSTEMATIST BLEPHAROSPASMS BOARDERCROSSES BOASTFULNESSES BOUILLABAISSES BRASSFOUNDINGS BREASTSTROKERS BRONTOSAURUSES CADAVEROUSNESS CAESAROPAPISMS CALAMITOUSNESS CANOROUSNESSES CAPRICIOUSNESS CAPTIOUSNESSES CASUALISATIONS CATASTROPHISMS CATASTROPHISTS CAUTIOUSNESSES CHIAROSCURISMS CHIAROSCURISTS CHIVALROUSNESS COENAESTHESIAS COETANEOUSNESS COLONIALNESSES COLOURFASTNESS COMMISSARYSHIP COMPASSIONATES COMPASSIONLESS CONSTABLESHIPS CONTAGIOUSNESS CONTRABASSISTS CONTRABASSOONS CONTRARINESSES COSMOGRAPHISTS COURAGEOUSNESS COWARDLINESSES CRANIOSCOPISTS CROSSABILITIES CROSSHATCHINGS CURVACEOUSNESS CURVACIOUSNESS CUSTODIANSHIPS CUSTOMISATIONS CYSTOLITHIASES CYSTOLITHIASIS DEBONAIRNESSES DEPERSONALISES DESERTISATIONS DESOLATENESSES DESPOTICALNESS DIAPHANOUSNESS DIESELISATIONS DILATORINESSES DISASSOCIATING DISASSOCIATION DISESTIMATIONS DISIMPASSIONED DISPENSATORIES DISPOSABLENESS DISSEMINATIONS DISSEVERATIONS DISSIMILATIONS DISSIMULATIONS DISSOCIALISING DISSOCIALITIES DOWNWARDNESSES EDACIOUSNESSES ENCOMPASSMENTS ENHYPOSTATISES ESCHATOLOGISTS ESCHSCHOLTZIAS ESOPHAGOSCOPES EXTRANEOUSNESS FABULOUSNESSES FACINOROUSNESS FACTIOUSNESSES FACTITIOUSNESS FALLACIOUSNESS FASHIOUSNESSES FASTIDIOUSNESS FATHOMLESSNESS FAVOUREDNESSES FEARSOMENESSES FETISHISATIONS FLAGITIOUSNESS FORNICATRESSES FORSAKENNESSES FOSSILISATIONS FOSSILIZATIONS FOURSQUARENESS GALACTOSIDASES GAMESOMENESSES GASTROPLASTIES GASTROSCOPISTS GELATINOUSNESS GENERALISSIMOS GEOSTRATEGISTS GLABROUSNESSES GLADSOMENESSES GLAMOUROUSNESS GLAUCOUSNESSES GLOBULARNESSES GLOSSOGRAPHERS GLOSSOGRAPHIES GRACIOUSNESSES GRATUITOUSNESS GREGARIOUSNESS HALLOWEDNESSES HANDSOMENESSES HARMONIOUSNESS HEADSTRONGNESS HEROICALNESSES HETEROGLOSSIAS HISTOPLASMOSES HISTOPLASMOSIS HISTORICALNESS HOMOSEXUALISMS HOMOSEXUALISTS HOSPITABLENESS IDIOSYNCRASIES IDOLATROUSNESS IGNORANTNESSES IMMUNOASSAYIST IMPERSONALISES INAPPOSITENESS INCAUTIOUSNESS INCHOATENESSES INFAMOUSNESSES INTROGRESSANTS IRONICALNESSES ISOMERISATIONS JOHNSONGRASSES KNOWABLENESSES LABOUREDNESSES LANGUOROUSNESS LANUGINOUSNESS LAPAROSCOPISTS LASCIVIOUSNESS LOATHFULNESSES LOQUACIOUSNESS LOVEABLENESSES MALODOROUSNESS MANIFOLDNESSES MARVELLOUSNESS MASSIFICATIONS MASSOTHERAPIES MASSOTHERAPIST MATRONLINESSES MENDACIOUSNESS MESMERISATIONS MESOCEPHALISMS MICROCASSETTES MIRACULOUSNESS MISANTHROPISTS MISANTHROPOSES MISASSUMPTIONS MISESTIMATIONS MISOBSERVANCES MISPERSUASIONS MISSIONARISING MISSIONISATION MODERATENESSES MONOGAMOUSNESS MONOSYLLABISMS MORDACIOUSNESS MOVEABLENESSES NARCOSYNTHESES NARCOSYNTHESIS NAUSEOUSNESSES NECESSITATIONS NECTAREOUSNESS NEGOTIATRESSES NEOCLASSICISMS NEOCLASSICISTS NEOPLASTICISMS NEOPLASTICISTS NONAGGRESSIONS NONCLASSIFIEDS NONRESISTANCES NONSPECIALISTS NUGATORINESSES OBDURATENESSES OBSERVABLENESS OCCASIONALISMS OCCASIONALISTS OESOPHAGITISES OLEAGINOUSNESS OMBUDSMANSHIPS OMPHALOSKEPSES OMPHALOSKEPSIS OPISTHOGLOSSAL ORACULARNESSES ORCHARDGRASSES ORCHESTRALISTS ORDINARINESSES OSTEOARTHROSES OSTEOARTHROSIS OUTDATEDNESSES OUTLANDISHNESS OUTRAGEOUSNESS OVERASSERTIONS OVERASSESSMENT OVERCLASSIFIES OVEREMPHASISES OVERRASHNESSES PASSIONATENESS PASSIONFLOWERS PASTORALNESSES PATULOUSNESSES PERISSODACTYLS PERSONABLENESS PHOSPHOKINASES PHOSPHOLIPASES PHOSPHORYLASES PHRASEOLOGISTS PLESIOSAURIANS PODSOLISATIONS POETICALNESSES POLYSYLLABISMS POSSESSIONATES POSTERISATIONS POSTLAPSARIANS POSTMASTERSHIP POSTULANTSHIPS PRECARIOUSNESS PREDACEOUSNESS PREDACIOUSNESS PRESSURISATION PROFESSORIATES PROSOPAGNOSIAS PROVABLENESSES PSEPHOANALYSES PSEPHOANALYSIS PSEUDARTHROSES PSEUDARTHROSIS PSEUDOCLASSICS PSYCHOANALYSES PSYCHOANALYSIS PSYCHOANALYSTS PSYCHOPATHISTS PSYCHOSOMATICS PUGNACIOUSNESS QUOTABLENESSES RADIOSENSITISE RAMPAGEOUSNESS RATIONALNESSES RAVENOUSNESSES REASONABLENESS RECESSIONISTAS REHOSPITALISES RESOLVABLENESS RESTORABLENESS RESUSCITATIONS RETRANSMISSION SACERDOTALISES SACERDOTALISMS SACERDOTALISTS SACRALISATIONS SACROILIITISES SACROSANCTNESS SADOMASOCHISMS SADOMASOCHISTS SALPIGLOSSISES SALUBRIOUSNESS SANITATIONISTS SANSCULOTTIDES SANSCULOTTISMS SANSCULOTTISTS SCABROUSNESSES SCANDALOUSNESS SCAPEGALLOWSES SCENARISATIONS SCHOLASTICATES SCHOLASTICISMS SEASONABLENESS SEASONALNESSES SECTORISATIONS SEISMOGRAPHERS SEISMOGRAPHIES SEMASIOLOGISTS SEMICONSONANTS SENSATIONALISE SENSATIONALISM SENSATIONALIST SENSITISATIONS SENSITIZATIONS SENSUALISATION SEPARATIONISMS SEPARATIONISTS SEQUACIOUSNESS SEQUESTRATIONS SERIALISATIONS SEXUALISATIONS SHADOWCASTINGS SHARPSHOOTINGS SIGNALISATIONS SIMULTANEOUSES SINANTHROPUSES SINISTRORSALLY SLANDEROUSNESS SNOWBOARDCROSS SOCIABLENESSES SOCIALISATIONS SOFTHEADEDNESS SOLEMNISATIONS SOLIFIDIANISMS SOLITARINESSES SOLVABLENESSES SOMAESTHESISES SOPHISTICATORS SORBITISATIONS SOREHEADEDNESS SOUTHEASTWARDS SOUTHWESTWARDS SOVIETISATIONS SPACIOUSNESSES SPARROWGRASSES SPECTATORSHIPS SPELAEOLOGISTS SPERMATOBLASTS SPHAGNOLOGISTS SPIROCHAETOSES SPIROCHAETOSIS SPOKESMANSHIPS SPORADICALNESS SPORTSMANLIEST SPORTSMANSHIPS SQUAMOSENESSES SQUAMOUSNESSES STABILISATIONS STATIONARINESS STATIONMASTERS STENOGRAPHISTS STERILISATIONS STERNOMASTOIDS STOMACHFULNESS STOMATOLOGISTS STONEMASONRIES STREPTOKINASES STROPHANTHUSES SUBADOLESCENTS SUBASSOCIATION SUBCATEGORISES SUBDEACONSHIPS SUBSATURATIONS SUBSIDISATIONS SUBSIDIZATIONS SUBSPONTANEOUS SUBSTANTIATORS SUBTILISATIONS SUCCESSIONALLY SULFURISATIONS SUMMARISATIONS SUPERLOYALISTS SUPERORGANISMS SURROGATESHIPS SUSPERCOLLATES SWORDSMANSHIPS SYLLOGISATIONS SYMBOLICALNESS SYMBOLISATIONS SYNAPOSEMATISM SYNCHROFLASHES SYNTHESISATION SYPHILISATIONS SYSTEMISATIONS SYSTEMIZATIONS TACHISTOSCOPES TEMPORALNESSES THOROUGHBASSES TOPOISOMERASES TOWARDLINESSES TRAITOROUSNESS TRANSFUSIONIST TRANSGRESSIONS TRANSISTORISED TRANSISTORISES TRANSISTORIZES TRANSITORINESS TRANSMISSIONAL TRANSPOSITIONS UMBRAGEOUSNESS UNGRACIOUSNESS UNHANDSOMENESS UNSAVORINESSES UNSEASONEDNESS UNSOCIABLENESS UNTOWARDNESSES UPROARIOUSNESS VAPORISHNESSES VAPOROUSNESSES VIDEOCASSETTES VILLAINOUSNESS VIOLABLENESSES VISUALISATIONS VIVIPAROUSNESS VOIDABLENESSES VOLATILENESSES WOMANISHNESSES WORKABLENESSES