There are 623 thirteen-letter words containing A, P, 2S and T, https://www.bestwordlist.com/c/a/5/13letterwordswithapsst.htm
ACCEPTINGNESS ACCOMPANYISTS ADAPTABLENESS ADAPTEDNESSES AETHRIOSCOPES
ALPHABETISERS AMPULLOSITIES ANGIOPLASTIES ANISOTROPISMS ANTEPOSITIONS
ANTISEPTICISE ANTISEPTICISM ANTISPASMODIC ANTISTROPHONS APATOSAURUSES
APFELSTRUDELS APICULTURISTS APOCALYPTISMS APOCALYPTISTS APOCATASTASES
APOCATASTASIS APOSTOLICISMS APOSTROPHISED APOSTROPHISES APOSTROPHIZES
APOSTROPHUSES APOTHEOSISING APPETISEMENTS APPRAISEMENTS ARCTOPHILISTS
ARSENOPYRITES ARTHROSCOPIES ARTHROSPOROUS ASPHETERISING ASPHYXIATIONS
ASSISTANTSHIP ASSOCIATESHIP ASTHENOSPHERE ASTROPHYSICAL ATTORNEYSHIPS
AUTOEXPOSURES AUTOMORPHISMS BALLISTOSPORE BARRISTERSHIP BIPARTISANISM
BLASTOSPHERES BLEPHARITISES BOOTSTRAPPERS BREASTPLOUGHS CARTOPHILISTS
CARYOPTERISES CATASTROPHISM CATASTROPHIST CEROGRAPHISTS CHAPTERHOUSES
CHROMATOPSIAS COAUTHORSHIPS COMPACTEDNESS COMPACTNESSES COMPASSIONATE
COMPENSATIONS COMPLIANTNESS CONSPIRACISTS CONSPIRATIONS CONSPIRATRESS
CONSTABLESHIP CONSTIPATIONS CONTRAPPOSTOS COPROPHAGISTS CORPORATENESS
CORPOREALISTS COSMOGRAPHIST COSMOPOLITANS COUNTERSCARPS CRAFTMANSHIPS
CRAFTSMANSHIP CRAFTSPERSONS CRANIOSCOPIST CRAPULOSITIES CREATURESHIPS
CRYPTANALYSES CRYPTANALYSIS CRYPTANALYSTS CRYPTESTHESIA CRYPTOGAMISTS
CRYPTOMNESIAS CUSTODIANSHIP CYCLOPAEDISTS CYSTOGRAPHIES DEASPIRATIONS
DECAPITALISES DECOMPENSATES DEMOGRAPHISTS DEPOSITATIONS DEPUTISATIONS
DESPERATENESS DESPOLIATIONS DESULPHURATES DEUTEROPLASMS DIASTROPHISMS
DICTATORSHIPS DISCEPTATIONS DISCEPTATIOUS DISCIPLINANTS DISCORPORATES
DISOPERATIONS DISPARATENESS DISPASSIONATE DISPENSATIONS DISPLACEMENTS
DISPLEASANTED DISPOSABILITY DISPOSITIONAL DISPROPRIATES DISSEPIMENTAL
DRAFTSMANSHIP DRAFTSPERSONS ECTOPARASITES ELEPHANTIASES ELEPHANTIASIS
EMPHYSEMATOUS ENCOMPASSMENT ENDOPARASITES ENHYPOSTASIAS ENHYPOSTATISE
EPISTOLARIANS ERGASTOPLASMS ERYSIPELATOUS ESCAPOLOGISTS ESOPHAGITIDES
ESOPHAGITISES ESPAGNOLETTES EXASPERATIONS EXOPEPTIDASES EXPANSIONISTS
EXPANSIVITIES EXPATRIATISMS EXPOSTULATORS FELDSPATHOIDS FISSIPARITIES
FORTEPIANISTS GASTEROPODOUS GASTROSCOPIES GASTROSCOPIST GASTROSOPHERS
GASTROSOPHIES GRADUATESHIPS GRAMOPHONISTS GRANTSMANSHIP GRAPHOLOGISTS
GRAVITROPISMS HAIRSPLITTERS HAPPENSTANCES HAPTOTROPISMS HEMATOPOIESES
HEMATOPOIESIS HEMIPARASITES HEPATISATIONS HEPATOLOGISTS HEPATOSCOPIES
HETEROPLASIAS HIPPOPHAGISTS HOLOPARASITES HOMEOPATHISTS HOSPITALISING
HOSPITALITIES HOUSEPAINTERS HUNTSMANSHIPS HYDROPATHISTS HYPAESTHESIAS
HYPERESTHESIA HYPERREALISTS HYPERSTHENIAS HYPOGNATHISMS HYPOSTASISING
HYPOSTASIZING HYPOSTATISING HYPOSULPHATES IMPARTIALNESS IMPASSABILITY
IMPASSIBILITY IMPASSIVITIES IMPERSONATORS IMPOSTHUMATES IMPROVISATORS
IMPUTABLENESS INSPECTORATES INSPISSATIONS INTERSPERSALS ITHYPHALLUSES
JUSTICIARSHIP KINESIPATHIES KINESIPATHIST LAPAROSCOPIST LAUREATESHIPS
LEUCOPLASTIDS LYMPHOMATOSES LYMPHOMATOSIS MAGNETOPAUSES MAMMAPLASTIES
MAMMOPLASTIES MASTIGOPHORES MEDIATORSHIPS MESOTHERAPIES METAMORPHISMS
METAMORPHISTS METAMORPHOSES METAMORPHOSIS METAPHYSICISE METAPHYSICIST
MICROPLASTICS MISANTHROPIES MISANTHROPIST MISASSUMPTION MISPLACEMENTS
MISPUNCTUATES MONOGRAPHISTS MULTICAMPUSES MUNICIPALISTS NEOPLASTICISM
NEOPLASTICIST NEUROPATHISTS NONPHOSPHATES NONSPECIALIST OBSTREPERATES
ONOMATOPOESES ONOMATOPOESIS OPERATIONISMS OPERATIONISTS OPERATIVENESS
OPISTHOGRAPHS OPISTHOSOMATA OPSONISATIONS OPSONIZATIONS OPTIMISATIONS
ORTHOPAEDISTS OSTEOGRAPHIES OSTEOPATHISTS OSTEOPLASTIES OSTREOPHAGIES
OSTREOPHAGOUS OUTPASSIONING PAEDOBAPTISMS PAEDOBAPTISTS PAGANISATIONS
PAINTERLINESS PALATABLENESS PALINDROMISTS PALINGENESIST PALYNOLOGISTS
PANAESTHESIAS PANAESTHETISM PANPSYCHISTIC PANSEXUALISTS PANSPERMATISM
PANSPERMATIST PANTOPHAGISTS PAPYROLOGISTS PARAESTHESIAS PARAGNATHISMS
PARAGRAPHISTS PARALYSATIONS PARAMETERISES PARASITAEMIAS PARASITICIDES
PARASYMBIONTS PARASYNTHESES PARASYNTHESIS PARCHMENTISES PARENTHESISED
PARENTHESISES PARENTHESIZES PAROTIDITISES PARTIALNESSES PARTISANSHIPS
PARTITIONISTS PARTIZANSHIPS PASSEMENTERIE PASSIBILITIES PATRIARCHISMS
PATRISTICISMS PEDESTRIANISE PEDESTRIANISM PENALISATIONS PENTASTICHOUS
PERIGASTRITIS PERIOSTRACUMS PERISSODACTYL PERMANENTNESS PERPETUALISMS
PERPETUALISTS PERSEVERATORS PERSONALISTIC PERSONALITIES PERSPIRATIONS
PESSIMISTICAL PHALANSTERIES PHALANSTERISM PHALANSTERIST PHARYNGITISES
PHONASTHENIAS PHOSPHATIDYLS PHOSPHATISING PHOSPHATURIAS PHOTOREALISMS
PHOTOREALISTS PHRAGMOPLASTS PHRASEOLOGIST PHYSICALISTIC PHYSICALITIES
PHYSIOLATRIES PICTORIALISES PICTORIALISMS PICTORIALISTS PICTORIALNESS
PIQUANTNESSES PLAGIOSTOMOUS PLAINTIVENESS PLANETESIMALS PLASMODESMATA
PLASTERBOARDS PLASTERSTONES PLASTINATIONS PLASTOCYANINS PLASTOMETRIES
PLICATENESSES PNEUMATOLYSES PNEUMATOLYSIS PODSOLISATION POETASTERINGS
POLARISATIONS POLITICALISES POLITICASTERS POLYGRAPHISTS POLYTONALISMS
POLYTONALISTS POSSESSIONATE POSTCLASSICAL POSTDILUVIANS POSTDOCTORALS
POSTERISATION POSTGRADUATES POSTHOLOCAUST POSTILLATIONS POSTISOLATION
POSTLAPSARIAN POSTLITERATES POSTMENOPAUSE POSTMENSTRUAL POSTROMANTICS
POSTSECONDARY POSTULANTSHIP POSTVASECTOMY POTABLENESSES POTAMOLOGISTS
PRACTICALISMS PRACTICALISTS PRACTICALNESS PRAGMATICISMS PRAGMATICISTS
PRECISIANISTS PREDATORINESS PREDESIGNATES PREDESTINATES PREDIABETESES
PREGUSTATIONS PREHISTORIANS PREMATURENESS PRESANCTIFIES PRESBYTERATES
PRESBYTERIALS PRESBYTERIANS PRESENTATIONS PRESERVATIONS PRESERVATIVES
PRESTIGIATORS PREVALENTNESS PRINTABLENESS PRIVATENESSES PROCONSULATES
PROFESSORATES PROFESSORIATE PROFESSORIATS PROLATENESSES PROPAGANDISTS
PROSTACYCLINS PROSTANTHERAS PROSTATITISES PROTESTATIONS PROXIMATENESS
PSEUDOMARTYRS PSYCHASTHENIA PSYCHASTHENIC PSYCHIATRISTS PSYCHOANALYST
PSYCHOPATHICS PSYCHOPATHIES PSYCHOPATHIST PSYCHOSOMATIC PTEROSAURIANS
PULSATILITIES PYROSULPHATES QUAESTORSHIPS RADIOISOTOPES RADIOPHONISTS
RAPTUROUSNESS REABSORPTIONS REASSUMPTIONS RECAPITALISES REGISTRARSHIP
REHOSPITALISE RELATIONSHIPS REPRESENTANTS REPRISTINATES RESPONDENTIAS
RESUPINATIONS RETAINERSHIPS RHINOPLASTIES SALPINGITISES SANDPAINTINGS
SANDPAPERIEST SAPROPHYTISMS SATANOPHANIES SATANOPHOBIAS SCAPEGOATINGS
SCAPEGOATISMS SCOPTOPHILIAS SCOPTOPHOBIAS SCRATCHPLATES SCRIPTURALISM
SCRIPTURALIST SECRETARYSHIP SEMELPARITIES SEMIPARASITES SEMIPARASITIC
SEPARATIONISM SEPARATIONIST SEPTEMVIRATES SEPTUPLICATES SERGEANTSHIPS
SERJEANTSHIPS SEROTHERAPIES SESQUIPLICATE SEXTUPLICATES SHAPESHIFTERS
SHAPESHIFTING SHARPSHOOTERS SHARPSHOOTING SKEPTICALNESS SLIPSTREAMING
SLUMPFLATIONS SNAPSHOOTINGS SOMATOPLASTIC SOMATOPLEURES SOMATOTROPINS
SOPHISTICALLY SOPHISTICATED SOPHISTICATES SOPHISTICATOR SOUSAPHONISTS
SPAGHETTIFIES SPATTERDASHES SPECTATORSHIP SPECTATRESSES SPECTRALITIES
SPECTROGRAPHS SPECULARITIES SPECULATRICES SPECULATRIXES SPEEDBOATINGS
SPEEDSKATINGS SPELAEOLOGIST SPERMATOBLAST SPERMATOCELES SPERMATOCIDES
SPERMATOCYTES SPERMATOZOANS SPERMATOZOIDS SPHACELATIONS SPHAGNOLOGIST
SPHAIRISTIKES SPIFLICATIONS SPIRITUALISED SPIRITUALISER SPIRITUALISES
SPIRITUALISMS SPIRITUALISTS SPIRITUALIZES SPIRITUALNESS SPIRITUALTIES
SPLATTERPUNKS SPLENISATIONS SPLENIZATIONS SPONGIOBLASTS SPONTANEITIES
SPONTANEOUSLY SPORTSCASTERS SPORTSMANLIER SPORTSMANLIKE SPORTSMANSHIP
STAIRSTEPPING STANDPATTISMS STAPHYLITISES STASIMORPHIES STATESMANSHIP
STATESPERSONS STEEPLECHASED STEEPLECHASER STEEPLECHASES STEGANOGRAPHS
STEGANOPODOUS STENOGRAPHERS STENOGRAPHIES STENOGRAPHIST STENOPETALOUS
STEPDAUGHTERS STEPHANOTISES STIPENDIARIES STOMATOPLASTY STRAPHANGINGS
STRATOSPHERES STRATOSPHERIC STREPITATIONS STREPTOCARPUS STREPTOKINASE
STRIPPERGRAMS STROPHANTHINS STUPEFACIENTS STUPEFACTIONS STYLOGRAPHIES
SUBSPECIALIST SUBSPECIALITY SULPHONATIONS SULPHURATIONS SUPERANNUATES
SUPERATHLETES SUPERCABINETS SUPERCAUTIOUS SUPERELEVATES SUPEREROGATES
SUPERFRONTALS SUPERLOYALIST SUPERNATURALS SUPEROVULATES SUPERPATRIOTS
SUPERPLASTICS SUPERREALISTS SUPERSAFETIES SUPERSATURATE SUPERSTARDOMS
SUPERSTATIONS SUPERSTRATUMS SUPERTEACHERS SUPPLEMENTALS SUPPLICATIONS
SUPPOSITIONAL SURROGATESHIP SUSPERCOLLATE SYCOPHANTISED SYCOPHANTISES
SYCOPHANTISMS SYCOPHANTIZES SYCOPHANTRIES SYMPTOMATISED SYMPTOMATISES
SYMPTOMATIZES SYNADELPHITES SYNAPOSEMATIC SYPHILISATION TACHISTOSCOPE
TACHYPHRASIAS TAPHROGENESES TAPHROGENESIS TAPSALTEERIES TAPSIETEERIES
TELEGRAPHESES TELEGRAPHISTS TEMPERATENESS TEMPORARINESS TEMPTABLENESS
THERAPEUTISTS THIOSULPHATES THORACOSCOPES TOPOISOMERASE TOXOPLASMOSES
TOXOPLASMOSIS TRADESPEOPLES TRADESPERSONS TRAINSPOTTERS TRAMPOLINISTS
TRANSCRIPTASE TRANSHIPMENTS TRANSHIPPINGS TRANSPARENCES TRANSPERSONAL
TRANSPLANTERS TRANSPORTINGS TRANSPOSITION TRANSPOSITIVE TRANSSHIPMENT
TRANSSHIPPERS TRANSSHIPPING TRANSUMPTIONS TRAPSHOOTINGS TREASURERSHIP
TRICERATOPSES TRIPHOSPHATES TRIUMPHALISMS TRIUMPHALISTS TROPOSCATTERS
TRYPARSAMIDES TYPICALNESSES TYPOGRAPHISTS UNPARASITISED UNPASTEURISED
UNPLASTICISED UNTRESPASSING URANOPLASTIES VAPORISATIONS VIBRAHARPISTS
VIBRAPHONISTS WATERMANSHIPS YACHTSMANSHIP