There are 507 fifteen-letter words containing A, C, H and S, https://www.bestwordlist.com/c/a/4/15letterwordswithachs.htm
ACCOMPLISHMENTS ACCOUNTANTSHIPS ACHONDROPLASIAS ACHONDROPLASTIC
ACHROMATICITIES ACHROMATISATION ACROPARESTHESIA ACTINOCHEMISTRY
ACTINOTHERAPIES ADIATHERMANCIES AFFRANCHISEMENT ALCOHOLISATIONS
ALCOHOLIZATIONS ALCOHOLOMETRIES ANAESTHETICALLY ANAMORPHOSCOPES
ANARCHISTICALLY ANTAPHRODISIACS ANTHROPOPHOBICS ANTHROPOPSYCHIC
ANTIALCOHOLISMS ANTIAPHRODISIAC ANTIARRHYTHMICS ANTICHOLESTEROL
ANTICHRISTIANLY ANTIHELMINTHICS ANTIHISTAMINICS ANTIMONARCHISTS
ANTIPHLOGISTICS ANTISYPHILITICS ANTITHROMBOTICS APPRENTICEHOODS
APPRENTICESHIPS ARACHNOIDITISES ARCHAEOBOTANIES ARCHAEOBOTANIST
ARCHAEOMETRISTS ARCHAEOPTERYXES ARCHAEZOOLOGIES ARCHEOASTRONOMY
ARCHEOBOTANISTS ARCHEOMAGNETISM ARCHEOZOOLOGIES ARCHEOZOOLOGIST
ARCHGENETHLIACS ARCHIDIACONATES ARCHIEPISCOPACY ARCHIEPISCOPATE
ARCHPRIESTHOODS ARCHPRIESTSHIPS ASTROPHYSICALLY ASTROPHYSICISTS
ATHEROSCLEROSES ATHEROSCLEROSIS ATHEROSCLEROTIC ATMOSPHERICALLY
AUTHENTICATIONS AUTOCHTHONOUSLY AUTOSCHEDIASTIC AUTOSCHEDIAZING
BACCHANALIANISM BACKSCRATCHINGS BACTERIOPHAGIES BACTERIOPHAGOUS
BATRACHOPHOBIAS BENZANTHRACENES BIBLIOTHECARIES BIOGEOCHEMICALS
BLOCKHEADEDNESS BRACHIOSAURUSES BRACHISTOCHRONE BRACHYCEPHALICS
BRACHYCEPHALIES BRACHYCEPHALISM BRACHYCEPHALOUS BRACHYDACTYLIES
BRACHYDACTYLISM BRACHYDACTYLOUS BRACHYDIAGONALS BRACHYPINAKOIDS
BRACHYTHERAPIES BRAUNSCHWEIGERS BRONCHODILATORS BRONCHOGRAPHIES
BRONCHOSCOPICAL CANTHAXANTHINES CATECHISTICALLY CATECHUMENSHIPS
CATHETERISATION CATHODOGRAPHERS CATHODOGRAPHIES CATHOLICISATION
CEPHALOTHORACES CEPHALOTHORAXES CERVICOGRAPHIES CHALCOGRAPHISTS
CHAMBERLAINSHIP CHANCELLORSHIPS CHANGEABILITIES CHANGEFULNESSES
CHANNELISATIONS CHANNELIZATIONS CHANNELOPATHIES CHAPTALISATIONS
CHAPTALIZATIONS CHARACTERISABLE CHARACTERISTICS CHARGEABILITIES
CHEMICOPHYSICAL CHEMOAUTOTROPHS CHEMOPSYCHIATRY CHEMOTAXONOMIES
CHEMOTAXONOMIST CHEMOTHERAPISTS CHENOPODIACEOUS CHLAMYDOMONADES
CHLORITISATIONS CHLORITIZATIONS CHLOROTHIAZIDES CHLORPROMAZINES
CHLORPROPAMIDES CHLORTHALIDONES CHOLESTEROLEMIA CHOLESTYRAMINES
CHOLINESTERASES CHONDRICHTHYANS CHONDROCRANIUMS CHORDAMESODERMS
CHORIOALLANTOIS CHRESTOMATHICAL CHROMATICNESSES CHROMATOLOGISTS
CHROMATOPHOROUS CHROMATOSPHERES CHROMOTHERAPIES CHRONOTHERAPIES
CINCHONISATIONS CINCHONIZATIONS CLAUSTROPHILIAS CLAUSTROPHOBIAS
CLEARHEADEDNESS CLIMATOGRAPHIES COCHAIRMANSHIPS COLDHEARTEDNESS
COLLENCHYMATOUS COMMANDANTSHIPS COMMISSARYSHIPS COMPOTATIONSHIP
COMPUTERPHOBIAS CONSERVATORSHIP CONSULTANTSHIPS CORINTHIANISING
COUNTERSHADINGS CRASHWORTHINESS CROTONALDEHYDES CRYPTAESTHESIAS
CRYPTOGRAPHISTS CRYSTALLOGRAPHY CYBERCHONDRIACS CYPROHEPTADINES
CYTOPATHOLOGIES CYTOPATHOLOGIST DACTYLOGRAPHERS DACTYLOGRAPHIES
DEBAUCHEDNESSES DECHLORINATIONS DECHRISTIANISED DECHRISTIANISES
DECHRISTIANIZED DECHRISTIANIZES DEPHLOGISTICATE DERMATOGLYPHICS
DETACHABILITIES DIASTROPHICALLY DICHLOROETHANES DICHOTOMISATION
DICHROMATICISMS DISACCHARIDASES DISENCHANTINGLY DISENCHANTMENTS
DISENFRANCHISED DISENFRANCHISES DISINHERITANCES DOLICHOSAURUSES
DORSIBRANCHIATE ECHINODERMATOUS ECHOCARDIOGRAMS ECOCATASTROPHES
ECTOMYCORRHIZAS ELECTROGRAPHIES ENCEPHALITOGENS ENCEPHALOGRAPHS
ENCEPHALOTOMIES ENCHONDROMATOUS ENFRANCHISEMENT ESOPHAGOSCOPIES
ETHERIFICATIONS ETHNOHISTORICAL EUPHEMISTICALLY EUTROPHICATIONS
FEATHERSTITCHED FEATHERSTITCHES FETISHISTICALLY GEODEMOGRAPHICS
GEOSTROPHICALLY GLOSSOGRAPHICAL GLYCERALDEHYDES GRAPHICALNESSES
HAEMACYTOMETERS HAEMOCYTOMETERS HALLUCINOGENICS HAMAMELIDACEOUS
HARMONISTICALLY HARPSICHORDISTS HEARTSICKNESSES HEMICRYSTALLINE
HEMOCHROMATOSES HEMOCHROMATOSIS HENDECASYLLABIC HENDECASYLLABLE
HEPATICOLOGISTS HERESTHETICIANS HETERODACTYLOUS HETEROSCEDASTIC
HETEROSOCIALITY HIBERNICISATION HIERACOSPHINGES HIERACOSPHINXES
HISTOCHEMICALLY HISTOCOMPATIBLE HISTOPATHOLOGIC HISTORIOGRAPHIC
HOLOBLASTICALLY HOLOCRYSTALLINE HOMOCHLAMYDEOUS HOMOCHROMATISMS
HOMOPLASTICALLY HOMOSOCIALITIES HUMIDIFICATIONS HYDROCEPHALUSES
HYDROCORALLINES HYDRODYNAMICIST HYDROEXTRACTORS HYDROSTATICALLY
HYGROSCOPICALLY HYLOZOISTICALLY HYPERACTIVITIES HYPERCALCAEMIAS
HYPERCATABOLISM HYPERGLYCAEMIAS HYPERPHYSICALLY HYPERURICAEMIAS
HYPERVIGILANCES HYPOCHONDRIASES HYPOCHONDRIASIS HYPOCHONDRIASMS
HYPOCHONDRIASTS HYPOCRYSTALLINE HYPSOMETRICALLY ICHTHYOPHAGISTS
ICHTHYOSAURIANS ICHTHYOSAURUSES ICOSITETRAHEDRA INHARMONICITIES
INTERSCHOLASTIC IONOSPHERICALLY ISOTHIOCYANATES KAFFEEKLATSCHES
KINESTHETICALLY LEUCOCYTHAEMIAS LEXICOGRAPHISTS LICENTIATESHIPS
LISSENCEPHALIES LISSENCEPHALOUS LITHOCHROMATICS LYMPHOSARCOMATA
MACHINABILITIES MACRENCEPHALIAS MACRENCEPHALIES MASOCHISTICALLY
MATCHLESSNESSES MATHEMATICISING MATRIARCHALISMS MECHANISTICALLY
MECHANOMORPHISM MEGALOCEPHALIES MEGALOCEPHALOUS MESATICEPHALIES
MESATICEPHALOUS METACHROMATISMS METAMATHEMATICS METAPHYSICISING
METAPHYSICIZING MICROAEROPHILES MICROBAROGRAPHS MICROPHYSICALLY
MISCHARACTERISE MISCHARACTERIZE MONOCHLAMYDEOUS MONOCHROMATISMS
MONOSACCHARIDES MORPHINOMANIACS MULTICHARACTERS MUSICOTHERAPIES
MYELENCEPHALONS MYOCARDIOGRAPHS NEBUCHADNEZZARS NEUROPSYCHIATRY
NONACHIEVEMENTS NONCHARISMATICS NONHISTORICALLY NONHYSTERICALLY
NONPSYCHIATRIST NONPSYCHOACTIVE NONTHEISTICALLY NUDIBRANCHIATES
OESOPHAGOSCOPES OLIGOCYTHAEMIAS OLIGOSACCHARIDE OPHTHALMOSCOPES
OPHTHALMOSCOPIC ORCHESOGRAPHIES ORCHESTRATIONAL ORGANOCHLORINES
ORTHOCHROMATISM ORTHOPSYCHIATRY OSCILLOGRAPHIES OSTEOARTHRITICS
OSTEOPATHICALLY OVERORCHESTRATE PACHYMENINGITIS PANTHEISTICALLY
PARASYMPATHETIC PARTHENOCARPIES PARTHENOCARPOUS PATHOGENICITIES
PATRIARCHALISMS PHALLOCENTRISMS PHARISAICALNESS PHARMACEUTICALS
PHARMACOGNOSIES PHARMACOGNOSIST PHARMACOGNOSTIC PHARMACOLOGISTS
PHARMACOPOEIANS PHARMACOPOEISTS PHARMACOPOLISTS PHARYNGOSCOPIES
PHENAKISTOSCOPE PHENOMENALISTIC PHILOSOPHICALLY PHLOGISTICATING
PHONEMICISATION PHONETICISATION PHOSPHOCREATINE PHOSPHOCREATINS
PHOTODISSOCIATE PHOTODUPLICATES PHOTOELASTICITY PHTHALOCYANINES
PHYLLOSILICATES PHYSICOCHEMICAL PHYSIOGRAPHICAL PHYSIOLOGICALLY
PITHECANTHROPUS PLAGIOCEPHALIES PLAINCLOTHESMAN PLAINCLOTHESMEN
POLYCHROMATISMS POLYSACCHARIDES POLYSACCHAROSES POLYSYNTHETICAL
POSTHEMORRHAGIC PREANAESTHETICS PREHISTORICALLY PROCURATORSHIPS
PROSENCHYMATOUS PSEPHOLOGICALLY PSEUDEPIGRAPHIC PSYCHEDELICALLY
PSYCHIATRICALLY PSYCHOACOUSTICS PSYCHOANALYSERS PSYCHOANALYSING
PSYCHOANALYZERS PSYCHOANALYZING PSYCHOBIOGRAPHY PSYCHOCHEMICALS
PSYCHODELICALLY PSYCHOGENETICAL PSYCHOGENICALLY PSYCHOGERIATRIC
PSYCHOGRAPHICAL PSYCHOHISTORIAN PSYCHOLOGICALLY PSYCHOMETRICIAN
PSYCHOPATHOLOGY PSYCHOSEXUALITY PSYCHOTHERAPIES PSYCHOTHERAPIST
PSYCHROMETRICAL PYROTECHNICIANS RADICULOPATHIES REORCHESTRATING
REORCHESTRATION REPROACHFULNESS RHINENCEPHALONS RHINOSCLEROMATA
SACCHARIMETRIES SACCHARISATIONS SACCHARIZATIONS SACCHAROMETRIES
SACCHAROMYCETES SADOMASOCHISTIC SAPROPHYTICALLY SARCENCHYMATOUS
SCAPHOCEPHALICS SCAPHOCEPHALIES SCAPHOCEPHALISM SCAPHOCEPHALOUS
SCATHEFULNESSES SCEUOPHYLACIUMS SCHEMATISATIONS SCHEMATIZATIONS
SCHILLERISATION SCHILLERIZATION SCHISTOSOMIASES SCHISTOSOMIASIS
SCHIZOAFFECTIVE SCHOLARLINESSES SCHOOLMASTERING SCHOOLMASTERISH
SCHOOLTEACHINGS SCLEROTHERAPIES SCRATCHBUILDERS SCRATCHBUILDING
SCRIMSHANDERING SEARCHABILITIES SEARCHINGNESSES SEISMOGRAPHICAL
SELENOGRAPHICAL SEMILOGARITHMIC SERVOMECHANICAL SERVOMECHANISMS
SHOCKUMENTARIES SKETCHABILITIES SOCIOHISTORICAL SOPHISTICATEDLY
SOPHISTICATIONS SPECTROGRAPHIES SPEECHIFICATION SPHAEROCRYSTALS
SPHERICALNESSES SPINTHARISCOPES SPIROCHAETAEMIA SPLANCHNOLOGIES
STAPHYLOPLASTIC STEEPLECHASINGS STEGOCEPHALIANS STEREOGRAPHICAL
STOECHIOLOGICAL STOICHIOLOGICAL STRAIGHTJACKETS STRATIGRAPHICAL
STRATOSPHERICAL SULPHACETAMIDES SUPERCARGOSHIPS SYCOPHANTICALLY
SYMPATHECTOMIES SYMPATHETICALLY SYMPATHOMIMETIC SYNCHRONISATION
SYNCHRONISTICAL SYNCHRONIZATION SYNECDOCHICALLY TEACHABLENESSES
TECHNICALNESSES THALASSOCRACIES THALASSOGRAPHIC THALATTOCRACIES
THEATRICALISING THEATRICALITIES THEOSOPHISTICAL THICKHEADEDNESS
THORACOCENTESES THORACOCENTESIS THORACOPLASTIES TOUCHABLENESSES
TRANSHISTORICAL TREACHEROUSNESS TRICHINISATIONS TRICHINIZATIONS
TRICHOMONACIDES TRISOCTAHEDRONS UNCHRISTIANISED UNCHRISTIANISES
UNCHRISTIANIZED UNCHRISTIANIZES UNCHRISTIANLIKE UNPHILOSOPHICAL
UNSOPHISTICATED UNTEACHABLENESS WAPPENSCHAWINGS WELTANSCHAUUNGS
WHIMSICALNESSES ZYGOBRANCHIATES ZYGOPHYLLACEOUS