There are 577 fifteen-letter words containing A, L, P, S and T, https://www.bestwordlist.com/c/a/5/15letterwordswithalpst.htm
ACCEPTABILITIES ACCOMPLISHMENTS ACHONDROPLASTIC ADAPTABLENESSES
ALLOTETRAPLOIDS ALPHABETISATION ANISOTROPICALLY ANTHROPOLATRIES
ANTHROPOLOGISTS ANTICAPITALISMS ANTICAPITALISTS ANTIMONOPOLISTS
ANTINEOPLASTICS ANTIPERISTALSES ANTIPERISTALSIS ANTIPERISTALTIC
ANTIPHLOGISTICS ANTIREPUBLICANS ANTISHOPLIFTING ANTISPECULATION
ANTISPECULATIVE ANTISYPHILITICS APHELIOTROPISMS APOCALYPTICISMS
APOLIPOPROTEINS APOLITICALITIES APPEALABILITIES APPLICABILITIES
ASTROPHYSICALLY ATMOSPHERICALLY AUTOTETRAPLOIDS BALNEOTHERAPIES
BIBLIOTHERAPIES BIPOLARISATIONS BIPOLARIZATIONS BLAXPLOITATIONS
CAPITALISATIONS CAPITALIZATIONS CENTRIPETALISMS CENTUPLICATIONS
CEPHALOTHORACES CEPHALOTHORAXES CHALCOGRAPHISTS CHANNELOPATHIES
CHAPTALISATIONS CHAPTALIZATIONS CLAUSTROPHILIAS CLAUSTROPHOBIAS
CLIMATOGRAPHIES COMPARABILITIES COMPASSIONATELY COMPATIBILITIES
COMPLEMENTARIES COMPLIANTNESSES COMPLICATEDNESS COMPOSITIONALLY
COMPUTABILITIES CONCEPTUALISERS CONCEPTUALISING CONCEPTUALISTIC
CONCEPTUALITIES CONCEPTUALIZERS CONDUPLICATIONS CONSULTANTSHIPS
CONTRAPUNTALIST COSMOPOLITANISM COUNTEREXAMPLES COUNTERPROPOSAL
CRYSTALLOGRAPHY CYCLOPENTOLATES CYTOPATHOLOGIES CYTOPATHOLOGIST
CYTOPLASMICALLY DACTYLOGRAPHERS DACTYLOGRAPHIES DECOMPOSABILITY
DEPARTMENTALISE DEPARTMENTALISM DEPENDABILITIES DEPHLOGISTICATE
DEPHOSPHORYLATE DEPLORABILITIES DEPOLARISATIONS DEPOLARIZATIONS
DERMATOGLYPHICS DERMATOPLASTIES DESPICABILITIES DESPIRITUALISED
DESPIRITUALISES DESPIRITUALIZED DESPIRITUALIZES DESULPHURATIONS
DIAHELIOTROPISM DIASTROPHICALLY DIPLOMATOLOGIES DISAPPLICATIONS
DISAPPOINTINGLY DISPASSIONATELY DISPOSABILITIES DISPROPORTIONAL
DISPUTABILITIES DISREPUTABILITY DUPLICABILITIES EDRIOPHTHALMOUS
ELECTROGRAPHIES ELECTROPLATINGS EMPLOYABILITIES ENCEPHALITOGENS
ENCEPHALOTOMIES ENCYCLOPAEDISTS EPISTEMOLOGICAL EPITHELIALISING
EPITHELIOMATOUS EPITHELISATIONS EPITHELIZATIONS ESEMPLASTICALLY
EUPHEMISTICALLY EVAPORABILITIES EXCEPTIONALISMS EXCEPTIONALISTS
EXCEPTIONALNESS EXPANDABILITIES EXPANSIBILITIES EXPENDABILITIES
EXPERIENTIALISM EXPERIENTIALIST EXPERIMENTALISE EXPERIMENTALISM
EXPERIMENTALIST EXPLORATIONISTS EXPORTABILITIES EXPOSTULATINGLY
FLUOROPHOSPHATE GALACTOPOIETICS GALVANOPLASTIES GALVANOTROPISMS
GEOSTROPHICALLY HALFPENNYWORTHS HEPATICOLOGISTS HISTOCOMPATIBLE
HISTOPATHOLOGIC HOMOPLASTICALLY HOMOTRANSPLANTS HOSPITALISATION
HOSPITALIZATION HYPERCATABOLISM HYPERINFLATIONS HYPERMETABOLISM
HYPERSALINITIES HYPERSALIVATION HYPERSTIMULATED HYPERSTIMULATES
HYPERVENTILATES HYPNOTISABILITY HYPOCRYSTALLINE HYPSOMETRICALLY
IMPALPABILITIES IMPARTIALNESSES IMPARTIBILITIES IMPASSABILITIES
IMPASSIBILITIES IMPECCABILITIES IMPERISHABILITY IMPERSONALITIES
IMPLACABILITIES IMPLEMENTATIONS IMPLICATIVENESS IMPORTABILITIES
IMPRACTICALNESS IMPROBABILITIES IMPROVABILITIES IMPROVISATIONAL
IMPROVISATORIAL IMPUTABLENESSES INCULPABILITIES INDISPUTABILITY
INHOSPITALITIES INOPERABILITIES INSPIRATIONALLY INTERPAROXYSMAL
INTERPELLATIONS INTERPERSONALLY INTROSPECTIONAL ISOPERIMETRICAL
JURISPRUDENTIAL JUXTAPOSITIONAL LAPIDIFICATIONS LARYNGOSCOPISTS
LEGISLATORSHIPS LEUCOCYTOPENIAS LEUKOCYTOPENIAS LEXICOGRAPHISTS
LICENTIATESHIPS LIEUTENANTSHIPS LIPOGRAMMATISMS LIPOGRAMMATISTS
LYMPHADENITISES LYMPHOSARCOMATA LYOPHILISATIONS LYOPHILIZATIONS
MALAPPROPRIATES MALPRESENTATION MESATICEPHALIES MESATICEPHALOUS
METABISULPHITES METALLOGRAPHERS METALLOGRAPHIES METALLOGRAPHIST
METOCLOPRAMIDES METROPOLITANISE METROPOLITANISM MICROPULSATIONS
MISAPPLICATIONS MONOPOLISATIONS MONOPOLIZATIONS MONOPROPELLANTS
MULTIPARAMETERS MULTIPLICATIONS MULTIPOLARITIES NEPHROBLASTOMAS
NEUROPLASTICITY NONENCAPSULATED NONHOSPITALISED NONHOSPITALIZED
NONIMPLICATIONS NONSPECTACULARS NUCLEOPLASMATIC OMOPLATOSCOPIES
OPERATIONALISMS OPERATIONALISTS OPHTHALMOLOGIES OPHTHALMOLOGIST
OPHTHALMOMETERS OPHTHALMOSCOPES OPHTHALMOSCOPIC OPTIMALISATIONS
OPTIMALIZATIONS OSTEOPATHICALLY OVERCAPITALISED OVERCAPITALISES
OVERCAPITALIZES OVERCOMPLICATES OVERPOPULATIONS OVERSPECULATING
OVERSPECULATION PAINTERLINESSES PALAEBIOLOGISTS PALAEOBIOLOGIST
PALAEOBOTANISTS PALAEOECOLOGIST PALAEOGRAPHISTS PALAEOMAGNETISM
PALAEOMAGNETIST PALAEONTOLOGIES PALAEONTOLOGIST PALAEOZOOLOGIST
PALATABLENESSES PALATALISATIONS PALATALIZATIONS PALEOBIOLOGISTS
PALEOECOLOGISTS PALEOMAGNETISMS PALEOMAGNETISTS PALEONTOLOGISTS
PALEOZOOLOGISTS PAMPHLETEERINGS PANOPHTHALMITIS PANTHEISTICALLY
PANTISOCRATICAL PARABOLISATIONS PARABOLIZATIONS PARALINGUISTICS
PARANORMALITIES PARASEXUALITIES PARASITICALNESS PARASITOLOGICAL
PARASITOLOGISTS PARLIAMENTARISM PARTICULARISERS PARTICULARISING
PARTICULARISTIC PARTICULARITIES PARTICULARIZERS PATENTABILITIES
PATERFAMILIASES PATHOPHYSIOLOGY PATRIALISATIONS PATRIALIZATIONS
PATRIARCHALISMS PATRIFOCALITIES PENETRABILITIES PENINSULARITIES
PENTADACTYLISMS PERDURABILITIES PERFECTIBILIANS PERINATOLOGISTS
PERIPHERALITIES PERISHABILITIES PERISSODACTYLES PERISSODACTYLIC
PERISTALTICALLY PERMUTABILITIES PERSONALISATION PERSONALIZATION
PESSIMISTICALLY PHALLOCENTRISMS PHANTASMAGORIAL PHANTASMALITIES
PHARMACEUTICALS PHARMACOLOGISTS PHARMACOPOLISTS PHARYNGOLOGISTS
PHENETHYLAMINES PHENOMENALISTIC PHENOMENALITIES PHENYLBUTAZONES
PHENYLTHIOUREAS PHILANTHROPISTS PHILANTHROPOIDS PHILOSOPHASTERS
PHLOGISTICATING PHOSPHORYLATING PHOSPHORYLATION PHOSPHORYLATIVE
PHOTODUPLICATES PHOTOELASTICITY PHOTOJOURNALISM PHOTOJOURNALIST
PHOTOTELEGRAPHS PHTHALOCYANINES PHYLLOSILICATES PHYSIOPATHOLOGY
PICTORIALNESSES PINEALECTOMISED PINEALECTOMISES PINEALECTOMIZES
PISCICULTURALLY PLAGIOSTOMATOUS PLAINCLOTHESMAN PLAINCLOTHESMEN
PLAINTIVENESSES PLANTAGINACEOUS PLASMOLYTICALLY PLASTICISATIONS
PLASTICIZATIONS PLATINOCYANIDES PLATITUDINISERS PLATITUDINISING
PLATITUDINIZERS PLATITUDINOUSLY PLETHYSMOGRAPHS PLETHYSMOGRAPHY
PLURALISTICALLY PNEUMATOLOGISTS POLITICISATIONS POLITICIZATIONS
POLYARTHRITIDES POLYARTHRITISES POLYCHROMATISMS POLYCRYSTALLINE
POLYMERISATIONS POLYMERIZATIONS POLYSYNTHETICAL POLYUNSATURATED
POLYUNSATURATES PONDERABILITIES PONTIFICALITIES POPULARISATIONS
POPULARIZATIONS POSTADOLESCENCE POSTADOLESCENTS POSTAPOCALYPSES
POSTAPOCALYPTIC POSTCONSONANTAL POSTDEVALUATION POSTINOCULATION
POSTMILLENARIAN POSTMILLENNIALS POSTOPERATIVELY POSTPOLLINATION
POSTSTIMULATION POSTSTIMULATORY POSTULATIONALLY PRACTICABLENESS
PRACTICALNESSES PRAGMATICALNESS PREDICABILITIES PREDICTABLENESS
PREESTABLISHING PREFERABILITIES PREFERENTIALISM PREFERENTIALIST
PREHISTORICALLY PREINSTALLATION PREPOSITIONALLY PREPRESIDENTIAL
PREPUBLICATIONS PRESENTABLENESS PRESENTIALITIES PRESYNAPTICALLY
PREVALENTNESSES PRIMORDIALITIES PRINTABLENESSES PROBABILIORISTS
PROCELEUSMATICS PROCESSIONALIST PROFESSIONALIST PROFITABILITIES
PROLETARIANISED PROLETARIANISES PROLETARIANISMS PROLETARIANIZES
PROLETARIANNESS PROMOTABILITIES PROPAGABILITIES PROPOSITIONALLY
PROPYLITISATION PROSELYTISATION PROSELYTIZATION PROVINCIALITIES
PRUDENTIALITIES PSEUDOCOELOMATE PSEUDOMUTUALITY PSILANTHROPISMS
PSILANTHROPISTS PSYCHIATRICALLY PSYCHOGENETICAL PSYCHOPATHOLOGY
PSYCHOSEXUALITY PSYCHROMETRICAL PTERYLOGRAPHIES PUNISHABILITIES
PURITANICALNESS PUSILLANIMITIES PYRAMIDOLOGISTS QUADRUPLICITIES
RADICULOPATHIES RADIOTELEGRAPHS RADIOTELEPHONES RECAPITULATIONS
RECIPROCALITIES RECONCEPTUALISE RECTIPETALITIES REHOSPITALISING
REHOSPITALIZING REIMPLANTATIONS REPAIRABILITIES REPEATABILITIES
REPLICABILITIES REPOLARISATIONS REPOLARIZATIONS RESPECTABILISED
RESPECTABILISES RESPECTABILIZED RESPECTABILIZES RESPECTABLENESS
RESPIRABILITIES RESPIRITUALISED RESPIRITUALISES RESPIRITUALIZED
RESPIRITUALIZES SALPINGECTOMIES SAPROPHYTICALLY SCINTILLASCOPES
SCLEROTHERAPIES SELENOGRAPHISTS SEPTENTRIONALLY SIMPLICIDENTATE
SIMPLIFICATIONS SKEPTICALNESSES SLUMPFLATIONARY SOLIPSISTICALLY
SOPHISTICATEDLY SPATIALISATIONS SPATIALIZATIONS SPECIALISATIONS
SPECIALIZATIONS SPECTROSCOPICAL SPECULATIVENESS SPELEOTHERAPIES
SPERMATOBLASTIC SPHAEROCRYSTALS SPIRITUALNESSES SPIRONOLACTONES
SPREADABILITIES STADHOLDERSHIPS STADTHOLDERSHIP STAPHYLOPLASTIC
STAPHYLORRHAPHY STEEPLECHASINGS STEGOCEPHALIANS STEREOGRAPHICAL
STEREOTYPICALLY STIGMATOPHILIAS STIGMATOPHILIST STOMATOPLASTIES
STRATIGRAPHICAL STRATOSPHERICAL STREPHOSYMBOLIA STREPTOBACILLUS
SUBPROLETARIATS SUBSPECIALITIES SULPHACETAMIDES SULPHATHIAZOLES
SULPHONMETHANES SULPHURISATIONS SULPHURIZATIONS SUPERABUNDANTLY
SUPERADDITIONAL SUPERELEVATIONS SUPEREXALTATION SUPERLATIVENESS
SUPERNATIONALLY SUPERNATURALISE SUPERNATURALISM SUPERNATURALIST
SUPERNATURALIZE SUPEROVULATIONS SUPERPLASTICITY SUPERSPECIALIST
SUPERSPECTACLES SUPERSTIMULATED SUPERSTIMULATES SUPERSTRUCTURAL
SUPPLEMENTARIES SUPPLEMENTARILY SUPPLEMENTATION SUPPORTABLENESS
SUPPOSITIONALLY SUPRANATIONALLY SUSPERCOLLATING SYCOPHANTICALLY
SYMPATHETICALLY SYMPTOMATICALLY SYMPTOMATOLOGIC SYMPTOMOLOGICAL
TEENSPLOITATION TELAUTOGRAPHIES TELEPHOTOGRAPHS TEMPERABILITIES
TEMPTABLENESSES THALASSOGRAPHER THALASSOGRAPHIC THALASSOTHERAPY
THEOSOPHISTICAL THORACOPLASTIES THROMBOPLASTINS TRANSCRIPTIONAL
TRANSCRIPTIVELY TRANSPIRATIONAL TRANSPLANTATION TRANSPOSABILITY
TRANSPOSITIONAL TRIPERSONALISMS TRIPERSONALISTS TRIPHENYLAMINES
TROPICALISATION ULTRACREPIDATES ULTRAMICROSCOPE ULTRAMICROSCOPY
ULTRAPRECISIONS ULTRASONOGRAPHY UNAPOSTOLICALLY UNCOMPLAISANTLY
UNDERCAPITALISE UNPRACTICALNESS UNPRINTABLENESS UNPUNCTUALITIES
UNSPECTACULARLY UNSPIRITUALISED UNSPIRITUALISES UNSPIRITUALIZED
UNSPIRITUALIZES UNSPORTSMANLIKE UPGRADABILITIES VAPOURABILITIES
XENOTRANSPLANTS