There are 624 twelve-letter words containing A, P, 2S and T, https://www.bestwordlist.com/c/a/5/12letterwordswithapsst.htm ABRUPTNESSES ABSORPTANCES ACATALEPSIES ACCOMPANISTS ADAPTIVENESS ADIAPHORISTS ADOPTIANISMS ADOPTIANISTS ADOPTIONISMS ADOPTIONISTS ADSCRIPTIONS AEROTROPISMS AFTERSUPPERS AGAPANTHUSES ALDOPENTOSES ALLOPATHISTS ALLOTROPISMS ALPHABETISES ALPROSTADILS AMATEURSHIPS AMPHISTOMOUS AMPHISTYLARS ANISOTROPIES ANISOTROPISM ANTIPATHISTS ANTISEPALOUS ANTISPASTICS ANTISTROPHES APOLITICISMS APOSTATISING APOSTLESHIPS APOSTOLICISM APOSTOLISING APOSTROPHISE APOTHEOSISED APOTHEOSISES APOTHEOSIZES APOTROPAISMS APPARENTNESS APPASSIONATO APPEASEMENTS APPOSITENESS ARTHROSCOPES ARTHROSPORES ARTISANSHIPS ARTOCARPUSES ASEPTICISING ASPERGATIONS ASPHETERISED ASPHETERISES ASPHETERISMS ASPHETERIZES ASPHYXIATORS ASPORTATIONS ASSUMPTIVELY ASTRAPHOBIAS ASTROCOMPASS ASTROPHOBIAS ASTROPHYSICS ASTROSPHERES ATHWARTSHIPS ATMOSPHERICS AUDIOTYPISTS AUDITORSHIPS AUTOHYPNOSES AUTOHYPNOSIS AUTOPLASTIES AUTOSAMPLERS BAPTISTERIES BATHYSCAPHES BATHYSPHERES BATSMANSHIPS BATTLESPACES BICUSPIDATES BLASTOSPHERE BLASTOSPORES BREASTPLATES CAESPITOSELY CANOPHILISTS CAPSULATIONS CAPTAINSHIPS CAPTIOUSNESS CARPOLOGISTS CATAPHORESES CATAPHORESIS CATASTROPHES CATCHPHRASES CEPHALITISES CERATOPSIANS CEROPLASTICS CHALKSTRIPES CHLOROPLASTS CHROMOPLASTS COMPARATISTS COMPENSATORS CONSPIRACIST CONSPIRATORS CONSTUPRATES CORPORATISES CORPORATISMS CORPORATISTS COSMOPLASTIC COTRANSPORTS CRAFTSPERSON CRAPSHOOTERS CREATORSHIPS CROSSPATCHES CURATORSHIPS CUSPIDATIONS DECAPSULATES DEPOSITARIES DESPERATIONS DESPUMATIONS DIAPOSITIVES DIASTROPHISM DIPEPTIDASES DIPHOSPHATES DIPLOMATESES DIPLOMATISES DIPLOMATISTS DISCEPTATORS DISPENSATION DISPENSATIVE DISPENSATORS DISPENSATORY DISPLEASANTS DISPUTATIONS DISPUTATIOUS DISSIPATEDLY DISSIPATIONS DRAFTSPERSON EMPASSIONATE ENCAPSULATES ENHYPOSTASIA EPANORTHOSES EPANORTHOSIS EPIGRAPHISTS EPISTOLARIES ERGASTOPLASM ERYTHROPSIAS ESCAPOLOGIST EUCALYPTUSES EXASPERATERS EXASPERATORS EXOPARASITES EXPANSIONIST EXPISCATIONS EXPOSTULATES FELDSPATHOSE FELSPATHOIDS FISSIPALMATE FLIPPANTNESS FORETOPMASTS GAMOTROPISMS GASTROPLASTY GASTROPODANS GASTROPODOUS GASTROSCOPES GASTROSCOPIC GASTROSOPHER GREASEPAINTS HALOPHYTISMS HARUSPICATES HEPTARCHISTS HIPPEASTRUMS HIPPIATRISTS HIPPODAMISTS HOMOPLASTIES HOSPITALISED HOSPITALISES HOSPITALISTS HOSPITALIZES HOSPITALLERS HOUSEPARENTS HUNTSMANSHIP HYLOPATHISMS HYLOPATHISTS HYPAESTHESIA HYPAESTHESIC HYPESTHESIAS HYPOPLASTIES HYPOSTASISED HYPOSTASISES HYPOSTASIZED HYPOSTASIZES HYPOSTATISED HYPOSTATISES HYPOSTATIZES HYPOSTHENIAS IDEOPRAXISTS IMPASSIONATE IMPASTATIONS IMPERIALISTS IMPERSONATES IMPOSTUMATES IMPROVISATES INCAPSULATES INSPIRATIONS INSPISSATING INSPISSATION INSPISSATORS INTERSPERSAL INTRASPECIES ISOMETROPIAS JANITORSHIPS KINETOPLASTS LANDSCAPISTS LIPIDOPLASTS LYMPHOBLASTS MAGNATESHIPS MAINTOPMASTS MAINTOPSAILS MALAPERTNESS MALAPROPISTS MALPOSITIONS MASSOTHERAPY MASTERPIECES METACARPUSES METAPHORISTS METAPSYCHICS MIDSHIPMATES MISANTHROPES MISANTHROPOS MYCOPHAGISTS MYOGRAPHISTS NAPHTHALISES NONHOSPITALS NONPARTISANS NOSTOPATHIES NOTAPHILISMS NOTAPHILISTS OBSTIPATIONS OBSTROPALOUS OCTOSEPALOUS OESOPHAGITIS OPERATORLESS OPHTHALMISTS OPSONISATION OSTEOPATHIES OSTEOPATHIST OSTEOPLASTIC OSTREOPHAGES OUTPASSIONED PACESETTINGS PAEDERASTIES PAEDIATRISTS PAEDOLOGISTS PAINSTAKINGS PAINTBRUSHES PAINTINESSES PALATIALNESS PALTRINESSES PANAESTHESIA PANCRATIASTS PANENTHEISMS PANENTHEISTS PANESTHESIAS PANPSYCHISTS PANSEXUALIST PANSPERMISTS PANTHERESSES PANTISOCRATS PANTOMIMISTS PAPILLITISES PARABAPTISMS PARACENTESES PARACENTESIS PARACHUTISTS PARACROSTICS PARAESTHESIA PARAGLOSSATE PARALLELISTS PARAMASTOIDS PARAMETRISES PARASITISING PARASTICHIES PARASTICHOUS PARATRANSITS PARENTHESISE PARESTHESIAS PARROTFISHES PARTISANSHIP PARTNERSHIPS PASSAMENTING PASSEMENTING PASSIONATELY PASSIONATING PASSIVATIONS PASTEURELLAS PASTEURISERS PASTEURISING PASTEURIZERS PASTORALISMS PASTORALISTS PASTORALNESS PASTOURELLES PASTURELANDS PATCHINESSES PATERNALISMS PATERNALISTS PATERNOSTERS PATHLESSNESS PATHOGENESES PATHOGENESIS PATHOLOGISES PATHOLOGISTS PATRISTICISM PATROLOGISTS PATROONSHIPS PATULOUSNESS PECTISATIONS PEDANTICISES PEDANTICISMS PENINSULATES PENTAMERISMS PENTAPOLISES PEPTISATIONS PERESTROIKAS PERFORATUSES PERISTALITHS PERLUSTRATES PERSEVERATES PERSONALISTS PERSONALTIES PERSONATINGS PERSONATIONS PERSULPHATES PESCATARIANS PESCETARIANS PETTICHAPSES PHAGOCYTISES PHAGOCYTISMS PHAGOCYTOSES PHAGOCYTOSIS PHANTASIASTS PHANTASTRIES PHEASANTRIES PHILATELISTS PHOSPHATASES PHOSPHATIDES PHOSPHATISED PHOSPHATISES PHOSPHATIZES PHOSPHORATES PHOTOFLASHES PHOTOMOSAICS PHOTONASTIES PHYSIATRISTS PHYSICALISTS PHYSIOLATERS PHYTOPLASMAS PISSASPHALTS PITIABLENESS PLAGIOSTOMES PLASMOSOMATA PLASTERINESS PLASTERSTONE PLASTERWORKS PLASTICISERS PLASTICISING PLASTICITIES PLASTICIZERS PLASTICKIEST PLASTICWARES PLASTOGAMIES PLASTOMETERS PLATEGLASSES PLEASANTNESS PLEASANTRIES PLEINAIRISTS PLIANTNESSES PLOUGHSTAFFS POETASTERIES POETICALNESS POLYAMORISTS POLYANTHUSES POLYCRYSTALS POLYMASTISMS POLYSORBATES PORTRAITISTS POSTHOSPITAL POSTILLATORS POSTNUPTIALS POSTORGASMIC POSTSURGICAL POSTSYNAPTIC POSTULANCIES POSTULATIONS PRAETORSHIPS PRAGMATISERS PRAVASTATINS PRECISIANIST PREESTABLISH PRELATESHIPS PRESAGEMENTS PRIESTCRAFTS PRIMATESHIPS PROBABILISTS PROFESSORATE PROFESSORIAT PROGNATHISMS PROSTRATIONS PROTAGONISMS PROTAGONISTS PROTHALLUSES PSAMMOPHYTES PSYCHIATRIES PSYCHIATRIST PUNCTUALISTS PUSTULATIONS PYROCLASTICS QUAESTORSHIP REASSUMPTION REPRIVATISES RESPECTABLES RESPIRATIONS RETINISPORAS RETINOSPORAS RHAPSODISTIC SAINTPAULIAS SAPROPELITES SAPROPHYTISM SAXOPHONISTS SCAPEGOATISM SCATOPHAGIES SCATOPHAGOUS SCISSIPARITY SCYPHISTOMAE SCYPHISTOMAS SEMIPARASITE SENATORSHIPS SEPARATENESS SEPARATISTIC SEPARATORIES SEPARATRICES SEPIOSTAIRES SEPTICAEMIAS SERGEANTSHIP SERJEANTSHIP SERVANTSHIPS SHAPESHIFTER SHARPSHOOTER SHINPLASTERS SINANTHROPUS SITIOPHOBIAS SLAPHAPPIEST SLIPSTREAMED SNAPSHOOTERS SNAPSHOOTING SNAPSHOTTING SOAPSUDSIEST SOCIOPATHIES SOMATOPLASMS SOPHISTICATE SOUSAPHONIST SPACEFLIGHTS SPACIALITIES SPAGHETTINIS SPANAKOPITAS SPANOKOPITAS SPARROWFARTS SPASMOLYTICS SPASTICITIES SPATIALISING SPATIALITIES SPATTERDOCKS SPATTERWORKS SPECIALISTIC SPECIALITIES SPECIFICATES SPECTACULARS SPECTATRICES SPECTATRIXES SPECTRALNESS SPECTROGRAMS SPECULATIONS SPECULATISTS SPEECHCRAFTS SPEEDSKATING SPELAEOTHEMS SPERMAPHYTES SPERMATHECAS SPESSARTINES SPESSARTITES SPHAIRISTIKE SPHEROPLASTS SPHRAGISTICS SPICULATIONS SPIFFLICATES SPIRITUALISE SPIRITUALISM SPIRITUALIST SPIROCHAETES SPLENISATION SPONGIOBLAST SPORTCASTERS SPORTSCASTER SPORULATIONS SPREADSHEETS SPRINGWATERS STAIRSTEPPED STANDPATTERS STANDPATTISM STAPHYLINIDS STATESPERSON STAUROSCOPES STAUROSCOPIC STEAROPTENES STEATOPYGIAS STEATOPYGOUS STEEPLECHASE STEEPLEJACKS STEGOCARPOUS STENOPHAGOUS STEPDANCINGS STEPFAMILIES STEREOGRAPHS STEVENGRAPHS STEWARDSHIPS STIPENDIATES STIPULACEOUS STIPULATIONS STRAPHANGERS STRATOPAUSES STRATOSPHERE STREETSCAPES STRIPPAGRAMS STRIPTEASERS STROPHANTHUS SUBAPOSTOLIC SUBPANATIONS SUBSPECIALTY SULPHURATORS SUMATRIPTANS SUPERALTERNS SUPERELASTIC SUPERFETATES SUPERHEATERS SUPERLATIVES SUPERMARKETS SUPERNATANTS SUPERNATIONS SUPERNATURES SUPEROCTAVES SUPERPLASTIC SUPERREALIST SUPERSTARDOM SUPERSTATION SUPERSTRATUM SUPERTANKERS SUPPLICAVITS SUPPORTANCES SUPPRESSANTS SUPPURATIONS SUPPURATIVES SUPRACRUSTAL SUPREMACISTS SUPREMATISMS SUPREMATISTS SUSCEPTANCES SUSPIRATIONS SYCOPHANTISE SYCOPHANTISH SYCOPHANTISM SYMPATHETICS SYMPATHISERS SYMPATHISING SYMPATHIZERS SYMPTOMATISE SYNAPTOSOMAL SYNAPTOSOMES SYNCOPATIONS SYNTHESPIANS TACHYPHASIAS TAPHONOMISTS TEACHERSHIPS TEASPOONFULS TEASPOONSFUL TECHNOSPEAKS TELEPATHISES TELEPATHISTS TEMPORALISES TEMPORALNESS TETRAPOLISES TETRASPOROUS TIMEPLEASERS TORSIOGRAPHS TOWNSCAPINGS TRADESPERSON TRAINEESHIPS TRAITORSHIPS TRANSALPINES TRANSHIPPERS TRANSPERSONS TRANSPHOBIAS TRANSPICUOUS TRANSPIERCES TRANSPONDERS TRANSPONDORS TRANSPORTALS TRANSPORTERS TRANSPOSABLE TRANSPOSINGS TRANSSHAPING TRANSSHIPPED TRANSSHIPPER TRAPPINESSES TRAPSHOOTERS TROPHOBLASTS TROPHOPLASMS TROPICALISES TRYPANOSOMES TUBOPLASTIES TYMPANITESES TYMPANITISES TYPECASTINGS UNPASSIONATE UNSHAPELIEST UNSYMPATHIES UTOPIANISERS VAPOROSITIES VISUOSPATIAL WATCHSPRINGS ZOOGRAPHISTS