There are 537 eleven-letter words containing 2A, 2I and S, https://www.bestwordlist.com/c/a/5/11letterwordswithaaiis.htm ABDICATIONS ABIRRITANTS ABIRRITATES ABLATITIOUS ABORIGINALS ACADEMICISM ACCLIMATISE ACETANILIDS ACIERATIONS ACOUSTICIAN ACRIFLAVINS ACTIVATIONS ACTUALISING ACTUALITIES ADIAPHORISM ADIAPHORIST ADMIRALSHIP ADMIRALTIES ADMIRATIONS ADOPTIANISM ADOPTIANIST ADRIAMYCINS ADVENTITIAS AERIALITIES AESTIVATING AESTIVATION AFFIXATIONS AFICIONADAS AFICIONADOS AGONISTICAL AGRARIANISM AHISTORICAL AIRMANSHIPS ALCAICERIAS ALIENATIONS ALINEATIONS ALITERACIES ALKALINISED ALKALINISES ALKALINIZES ALLIGATIONS ALLOCHIRIAS AMORALITIES AMPHISCIANS AMPLIATIONS ANADIPLOSIS ANAGNORISIS ANALOGISING ANARCHISING ANARCHISTIC ANATOMISING ANCILLARIES ANIMALISING ANIMALISTIC ANIMALITIES ANISEIKONIA ANISOGAMIES ANNIHILATES ANNUALISING ANODISATION ANOMALISTIC ANTICIPANTS ANTICIPATES ANTICLASTIC ANTICLINALS ANTIFASCISM ANTIFASCIST ANTIFASHION ANTIMONIALS ANTIMUSICAL ANTINOMIANS ANTIPARTIES ANTIPATHIES ANTIPATHIST ANTIPHRASIS ANTIQUARIES ANTIRACISMS ANTIRACISTS ANTIREALISM ANTIREALIST ANTISOCIALS ANTISPASTIC ANTISTATICS ANTISTATIST ANTITARNISH APHRODISIAC APHRODISIAS APPARITIONS APRICATIONS AQUATINTIST ARABICISING ARABILITIES ARABINOSIDE ARABISATION ARCHAICISMS ARMILLARIAS AROMATISING ARRAIGNINGS ARRIVANCIES ARTERIALISE ARTISANSHIP ASPIDISTRAS ASPIRATIONS ASSEGAAIING ASSIBILATED ASSIBILATES ASSIGNATION ASSIMILABLE ASSIMILABLY ASSIMILATED ASSIMILATES ASSIMILATOR ASSOCIATING ASSOCIATION ASSOCIATIVE ASTATICISMS ASTERIDIANS ASTIGMATICS ASTIGMATISM ATHEISTICAL ATOMISATION ATOMISTICAL ATONALITIES ATRABILIOUS AUDIOVISUAL AUSPICATING AUXILIARIES AXIOMATISED AXIOMATISES AXIOMATIZES BACILLEMIAS BACILLURIAS BACITRACINS BALANITISES BALKANISING BARBARISING BARBARITIES BARGAININGS BASICRANIAL BASIDIOCARP BASOPHILIAS BASTINADING BEAUTICIANS BIOASSAYING BIPARTISANS BIPINNARIAS BIRACIALISM CABBALISTIC CAIPIRINHAS CANDIDACIES CANDIDIASES CANDIDIASIS CANNIBALISE CANNIBALISM CANOPHILIAS CAPILLAIRES CAPILLARIES CAPITALISED CAPITALISES CAPITALISMS CAPITALISTS CAPITALIZES CAPITATIONS CAPTAINCIES CAPTAINRIES CAPTAINSHIP CARABINIERS CARDIALGIAS CARDIALGIES CARNALISING CARNALITIES CASTABILITY CASTIGATING CASTIGATION CASUALISING CASUALIZING CASUISTICAL CATHARISING CAUSABILITY CAUSALITIES CAVALIERISH CAVALIERISM CAVITATIONS CHAINSAWING CHARISMATIC CHINACHINAS CHRISTIANIA CICATRISANT CIRCASSIANS CISATLANTIC COULIBIACAS CREATIANISM CULINARIANS DAMASKINING DERACIALISE DIACAUSTICS DIAGONALISE DIALYSATION DIASTEMATIC DIATHERMIAS DICHASIALLY DIGLADIATES DILAPIDATES DILATANCIES DILATATIONS DINOSAURIAN DIPSOMANIAC DIPSOMANIAS DISACCHARID DISANIMATED DISANIMATES DISARRAYING DISPARAGING DIVAGATIONS DIVARICATES DRAMATICISM DRAMATISING EMACIATIONS EPIGASTRIAL ERADIATIONS ERASABILITY FACILITATES FAINEANCIES FAINEANTISE FALSIFIABLE FAMILIARISE FANATICISED FANATICISES FANATICISMS FANATICIZES FANTASISING FANTASIZING FASCIATIONS FASCINATING FASCINATION FASCINATIVE FASHIONISTA FASTIGIATED FIANCAILLES FRANGIPANIS FRUITARIANS FUSTILARIAN GAILLARDIAS GAINSAYINGS GAINSHARING GALLIAMBICS GALLIARDISE GALVANISING GARGARISING GLACIALISTS GLACIATIONS HABILITATES HABITATIONS HAEMATINICS HAGGADISTIC HAGIARCHIES HEMIANOPIAS HEMIANOPSIA HEMICRANIAS HISPANIDADS HISTAMINASE ICOSANDRIAN IMAGINARIES IMMANATIONS IMPANATIONS IMPARADISED IMPARADISES IMPASTATION INACTIVATES INADVISABLE INADVISABLY INCAPACIOUS INDAGATIONS INDAPAMIDES INGRATIATES INHABITANTS INHALATIONS INMARRIAGES INSALIVATED INSALIVATES INSATIATELY INSTANTIATE INVAGINATES INVALIDATES INVARIABLES INVARIANCES IPSILATERAL IRRADIANCES IRRADIATORS IRRADICATES IRRATIONALS ISALLOBARIC ITALIANATES ITALIANISED ITALIANISES ITALIANIZES JAMAHIRIYAS JANISSARIES JUBILARIANS KABBALISTIC KOULIBIACAS KOWHAIWHAIS KYANISATION LABIALISING LABIALITIES LACRIMARIES LAICISATION LAMINARIANS LAMINARISED LAMINARISES LAMINARIZES LAMINATIONS LAPIDARISTS LAPIDATIONS LATITANCIES LATITATIONS LAYMANISING LEISHMANIAE LEISHMANIAL LEISHMANIAS LIMITARIANS MADRIGALIST MAGAZINISTS MAGISTERIAL MAGISTRATIC MAGNIFICATS MAIDENHAIRS MAINTAINERS MAINTOPSAIL MAMMALITIES MANDARINISM MANORIALISM MARGINALISE MARGINALISM MARGINALIST MARINATIONS MARMALISING MARMARISING MARTIALISMS MARTIALISTS MASTICATING MASTICATION MATERIALISE MATERIALISM MATERIALIST MAXILLARIES MAXIMALISTS MAXIMATIONS MEDIASTINAL MIASMATICAL MIASMICALLY MIDSAGITTAL MISADAPTING MISALLIANCE MISANALYSIS MISASSAYING MISAWARDING MISCARRIAGE MISMANAGING MISMARRIAGE NANISATIONS NANIZATIONS NATIONALISE NATIONALISM NATIONALIST NAVIGATIONS PACIFICATES PAEDIATRICS PAEDIATRIES PAEDIATRIST PAGINATIONS PAINSTAKING PALINOPSIAS PALISADOING PALLIATIONS PALLIATIVES PANARITIUMS PANISLAMIST PARADISICAL PARAKITINGS PARALEIPSIS PARAPHILIAS PARAPHILICS PARASAILING PARASITICAL PARASITISED PARASITISES PARASITISMS PARASITIZED PARASITIZES PARASITOIDS PARASITOSIS PARASKIINGS PARASUICIDE PAREIDOLIAS PARMACITIES PARMIGIANOS PARTIALISED PARTIALISES PARTIALISMS PARTIALISTS PARTIALIZES PASIGRAPHIC PASSIVATING PASSIVATION PATINATIONS PATRIALISED PATRIALISES PATRIALISMS PATRIALIZES PATRIATIONS PATRICIATES PATRISTICAL PERSICARIAS PHARISAICAL PHARISAISMS PISCATORIAL PISCIFAUNAE PISCIFAUNAS PLAGIARISED PLAGIARISER PLAGIARISES PLAGIARISMS PLAGIARISTS PLAGIARIZES PLANARITIES PLASTILINAS PLEIOCHASIA PRACTICIANS PRISMATICAL QUINAQUINAS RACIALISING RACIALISTIC RADIALISING RADIALITIES RADICALISED RADICALISES RADICALISMS RADICALIZES RADICATIONS RAINMAKINGS RAINWASHING RAIYATWARIS RASCALITIES RATIONALISE RATIONALISM RATIONALIST REALISATION REASSAILING RHINOLALIAS SABBATISING SABBATIZING SACRALISING SACRALITIES SACRALIZING SACRIFICIAL SACROILIACS SAGINATIONS SAGITTARIES SAILBOATING SAILMAKINGS SAILPLANING SAINTPAULIA SALEABILITY SALICIONALS SALICORNIAS SALIENTIANS SALIVATIONS SALVABILITY SANGUINARIA SANITARIANS SANITARISTS SANITARIUMS SANITATIONS SANSEVIERIA SAQUINAVIRS SATIABILITY SATIRICALLY SATIRISABLE SATIRIZABLE SATISFIABLE SAURISCHIAN SCALABILITY SCAMBAITING SCIAMACHIES SEMIAQUATIC SEMINARIANS SEPTICAEMIA SHAMANISTIC SHANGHAIING SIGILLARIAN SIMVASTATIN SINUPALLIAL SITUATIONAL SKIAMACHIES SOLITARIANS SOPAIPILLAS SPATIALISED SPATIALISES SPATIALIZED SPATIALIZES STAIRCASING STALACTITIC STALAGMITIC STATISTICAL STIACCIATOS STIGMARIANS STIGMATICAL STRAVAIGING SUBIMAGINAL SYBARITICAL TAENIACIDES TAGLIARINIS TAILGATINGS TANTALISING TARTARISING THIAMINASES TILLANDSIAS TRITANOPIAS UNFAMILIARS UNSATIATING UNSATIRICAL VACATIONIST VALIDATIONS VANADINITES VANDALISING VANDALISTIC VASSALISING VASSALIZING VATICINATES VICARIANCES VICTORIANAS VILLAINAGES WASHABILITY WASSAILINGS WASSAILRIES ZAMINDARIES