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