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