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