There are 392 fifteen-letter words containing A, C, L, P and T, https://www.bestwordlist.com/c/a/5/15letterwordswithaclpt.htm ACANTHOCEPHALAN ACCEPTABILITIES ACCOMPANIMENTAL ACCOMPLISHMENTS ACHONDROPLASTIC ALLOTRIOMORPHIC AMPHITHEATRICAL ANISOTROPICALLY ANTHROPOLOGICAL ANTICAPITALISMS ANTICAPITALISTS ANTINEOPLASTICS ANTIPERISTALTIC ANTIPHLOGISTICS ANTIREPUBLICANS ANTISPECULATION ANTISPECULATIVE ANTISYPHILITICS APOCALYPTICALLY APOCALYPTICISMS APOLITICALITIES APPLICABILITIES APPROACHABILITY ASTROPHYSICALLY ATMOSPHERICALLY AUTOGRAPHICALLY AUTOMORPHICALLY AUTOTROPHICALLY CAPITALISATIONS CAPITALIZATIONS CENTRIPETALISMS CENTUPLICATIONS CEPHALOCHORDATE CEPHALOTHORACES CEPHALOTHORACIC CEPHALOTHORAXES CHALCOGRAPHISTS CHANNELOPATHIES CHAPTALISATIONS CHAPTALIZATIONS CHARTOGRAPHICAL CHEMOTROPICALLY CLAUSTROPHILIAS CLAUSTROPHOBIAS CLIMATOGRAPHIES COMPARABILITIES COMPARTMENTALLY COMPASSIONATELY COMPATIBILITIES COMPLEMENTARIES COMPLEMENTARILY COMPLEMENTARITY COMPLEMENTATION COMPLIANTNESSES COMPLICATEDNESS COMPLIMENTARILY COMPOSITIONALLY COMPUTABILITIES COMPUTATIONALLY CONCEPTUALISERS CONCEPTUALISING CONCEPTUALISTIC CONCEPTUALITIES CONCEPTUALIZERS CONCEPTUALIZING CONDUPLICATIONS CONSULTANTSHIPS CONTEMPLATIVELY CONTRAPROPELLER CONTRAPUNTALIST COSMOPOLITANISM COUNTEREXAMPLES COUNTERPLANNING COUNTERPLEADING COUNTERPROPOSAL CRYPTANALYTICAL CRYPTOGRAPHICAL CRYSTALLOGRAPHY CYCLOPENTADIENE CYCLOPENTOLATES CYTOPATHOLOGIES CYTOPATHOLOGIST CYTOPLASMICALLY DACTYLOGRAPHERS DACTYLOGRAPHIES DECIPHERABILITY DECOMPOSABILITY DEPHLOGISTICATE DERMATOGLYPHICS DESPICABILITIES DIASTROPHICALLY DISAPPLICATIONS DUPLICABILITIES ELECTROGRAPHIES ELECTROMYOGRAPH ELECTROPLATINGS ELECTROPORATION ENCEPHALITOGENS ENCEPHALOPATHIC ENCEPHALOTOMIES ENCYCLOPAEDISTS EPISTEMOLOGICAL ESEMPLASTICALLY EUPHEMISTICALLY EXCEPTIONALISMS EXCEPTIONALISTS EXCEPTIONALNESS EXEMPLIFICATION EXEMPLIFICATIVE GALACTOPOIETICS GEOSTROPHICALLY GLYPTOGRAPHICAL HELIOTROPICALLY HEPATICOLOGICAL HEPATICOLOGISTS HETEROGRAPHICAL HISTOCOMPATIBLE HISTOPATHOLOGIC HOMEOPATHICALLY HOMOPLASTICALLY HYDROPATHICALLY HYDROTROPICALLY HYPERCATABOLISM HYPERCATALECTIC HYPERCRITICALLY HYPERFUNCTIONAL HYPERMETROPICAL HYPOCRYSTALLINE HYPSOMETRICALLY IMPECCABILITIES IMPLACABILITIES IMPLICATIVENESS IMPRACTICALNESS INAPPLICABILITY INCOMPARABILITY INCOMPATIBILITY INCOMPUTABILITY INCULPABILITIES INEXPLICABILITY INTERPERCEPTUAL INTERPROVINCIAL INTROSPECTIONAL ISOPERIMETRICAL LAPIDIFICATIONS LARYNGOSCOPISTS LEUCOCYTOPENIAS LEUKOCYTOPENIAS LEXICOGRAPHISTS LICENTIATESHIPS LOPHOBRANCHIATE LYMPHOCYTOPENIA LYMPHOSARCOMATA MACROPRUDENTIAL MALACOPTERYGIAN MALPRACTITIONER MESATICEPHALIES MESATICEPHALOUS METAMORPHICALLY METOCLOPRAMIDES MICROPULSATIONS MISAPPLICATIONS MULTIPLICATIONS NEUROPATHICALLY NEUROPATHOLOGIC NEUROPLASTICITY NONENCAPSULATED NONIMPLICATIONS NONMETAPHORICAL NONOCCUPATIONAL NONSPECTACULARS NUCLEOPLASMATIC OMOPLATOSCOPIES OPHTHALMOSCOPES OPHTHALMOSCOPIC ORTHOPAEDICALLY OSTEOPATHICALLY OVERAPPLICATION OVERCAPITALISED OVERCAPITALISES OVERCAPITALIZED OVERCAPITALIZES OVERCOMPLICATED OVERCOMPLICATES OVERSPECULATING OVERSPECULATION PALAEOANTHROPIC PALAEOBOTANICAL PALAEOECOLOGIST PALEOECOLOGISTS PALEONTOLOGICAL PANTHEISTICALLY PANTISOCRATICAL PARAGENETICALLY PARAHELIOTROPIC PARALINGUISTICS PARALLACTICALLY PARASITICALNESS PARASITOLOGICAL PARENTHETICALLY PARTICIPATIONAL PARTICULARISERS PARTICULARISING PARTICULARISTIC PARTICULARITIES PARTICULARIZERS PARTICULARIZING PATRIARCHALISMS PATRIFOCALITIES PENTADACTYLISMS PERFECTIBILIANS PERIODONTICALLY PERIPATETICALLY PERISSODACTYLES PERISSODACTYLIC PERISTALTICALLY PESSIMISTICALLY PETROCHEMICALLY PHALLOCENTRISMS PHARMACEUTICALS PHARMACOLOGISTS PHARMACOPOLISTS PHENOMENALISTIC PHILANTHROPICAL PHLOGISTICATING PHOTOBIOLOGICAL PHOTOCHEMICALLY PHOTODUPLICATED PHOTODUPLICATES PHOTOELASTICITY PHOTOELECTRICAL PHOTOGEOLOGICAL PHOTOMECHANICAL PHOTOMETRICALLY PHOTOTACTICALLY PHOTOTROPICALLY PHTHALOCYANINES PHYLLOSILICATES PHYTOCHEMICALLY PHYTOPLANKTONIC PICTORIALNESSES PIEZOMETRICALLY PINEALECTOMISED PINEALECTOMISES PINEALECTOMIZED PINEALECTOMIZES PINOCYTOTICALLY PISCICULTURALLY PLAINCLOTHESMAN PLAINCLOTHESMEN PLANIMETRICALLY PLANOMETRICALLY PLANTAGINACEOUS PLASMOLYTICALLY PLASTICISATIONS PLASTICIZATIONS PLATINOCYANIDES PLATYHELMINTHIC PLURALISTICALLY PLUTOCRATICALLY PNEUMATOLOGICAL POLITICISATIONS POLITICIZATIONS POLYCARBOXYLATE POLYCHLORINATED POLYCHROMATISMS POLYCRYSTALLINE POLYGENETICALLY POLYSYNTHETICAL PONTIFICALITIES POSTADOLESCENCE POSTADOLESCENTS POSTAPOCALYPSES POSTAPOCALYPTIC POSTCONSONANTAL POSTINOCULATION PRACTICABLENESS PRACTICALNESSES PRAGMATICALNESS PREAGRICULTURAL PRECANCELLATION PRECIPITABILITY PREDICABILITIES PREDICTABLENESS PREHISTORICALLY PREPUBLICATIONS PRESYNAPTICALLY PROBLEMATICALLY PROCELEUSMATICS PROCESSIONALIST PRONUNCIATIONAL PROTEOLYTICALLY PROTOZOOLOGICAL PROVINCIALITIES PSEUDOCOELOMATE PSYCHIATRICALLY PSYCHOGENETICAL PSYCHOPATHOLOGY PSYCHOSEXUALITY PSYCHROMETRICAL PULMOBRANCHIATE PURITANICALNESS PYROTECHNICALLY QUADRUPLICATING QUADRUPLICATION QUADRUPLICITIES QUINTUPLICATING QUINTUPLICATION RADICULOPATHIES RADIOTELEPHONIC RECAPITULATIONS RECIPROCALITIES RECONCEPTUALISE RECONCEPTUALIZE RECTIPETALITIES REDUPLICATIVELY REPLICABILITIES RESPECTABILISED RESPECTABILISES RESPECTABILIZED RESPECTABILIZES RESPECTABLENESS SALPINGECTOMIES SAPROPHYTICALLY SCINTILLASCOPES SCLEROTHERAPIES SIMPLICIDENTATE SIMPLIFICATIONS SKEPTICALNESSES SOLIPSISTICALLY SOPHISTICATEDLY SPECIALISATIONS SPECIALIZATIONS SPECTROSCOPICAL SPECULATIVENESS SPERMATOBLASTIC SPHAEROCRYSTALS SPIRONOLACTONES STAPHYLOPLASTIC STEEPLECHASINGS STEGOCEPHALIANS STEREOGRAPHICAL STEREOTYPICALLY STRATIGRAPHICAL STRATOSPHERICAL STREPTOBACILLUS SUBSPECIALITIES SULPHACETAMIDES SUPERPLASTICITY SUPERSPECIALIST SUPERSPECTACLES SUPERSTRUCTURAL SUSPERCOLLATING SYCOPHANTICALLY SYMPATHETICALLY SYMPTOMATICALLY SYMPTOMATOLOGIC SYMPTOMOLOGICAL TELEGRAPHICALLY THALAMENCEPHALA THALASSOGRAPHIC THEOSOPHISTICAL THERAPEUTICALLY THORACOPLASTIES TOPOGRAPHICALLY TRANSCRIPTIONAL TRANSCRIPTIVELY TROPICALISATION TROPICALIZATION TYPOGRAPHICALLY ULTRACREPIDATED ULTRACREPIDATES ULTRAMICROSCOPE ULTRAMICROSCOPY ULTRAPRECISIONS UNACCEPTABILITY UNANTICIPATEDLY UNAPOSTOLICALLY UNCOMPLAISANTLY UNCOMPLIMENTARY UNCOOPERATIVELY UNCOPYRIGHTABLE UNDERCAPITALISE UNDERCAPITALIZE UNEXCEPTIONABLE UNEXCEPTIONABLY UNEXCEPTIONALLY UNPATRIOTICALLY UNPRACTICALNESS UNPUNCTUALITIES UNSPECTACULARLY XYLOTYPOGRAPHIC ZOOPHYTOLOGICAL