There are 818 fifteen-letter words containing A, H, I and S, https://www.bestwordlist.com/c/a/4/15letterwordswithahis.htm
ACCOMPLISHMENTS ACCOUNTANTSHIPS ACHONDROPLASIAS ACHONDROPLASTIC
ACHROMATICITIES ACHROMATISATION ACROPARESTHESIA ACTINOCHEMISTRY
ACTINOTHERAPIES ADENOHYPOPHYSIS ADIATHERMANCIES AEROLITHOLOGIES
AFFRANCHISEMENT AIRWORTHINESSES ALCOHOLISATIONS ALCOHOLIZATIONS
ALCOHOLOMETRIES ALEXIPHARMAKONS ALLELOMORPHISMS ALPHABETISATION
ALUMINOTHERMIES AMBASSADORSHIPS AMINOPHENAZONES AMPHIDIPLOIDIES
ANAESTHESIOLOGY ANAESTHETICALLY ANARCHISTICALLY ANESTHETISATION
ANESTHETIZATION ANNIHILATIONISM ANTAPHRODISIACS ANTHROPOGENESIS
ANTHROPOLATRIES ANTHROPOLOGISTS ANTHROPOMETRIES ANTHROPOMETRIST
ANTHROPOPATHIES ANTHROPOPATHISM ANTHROPOPHAGIES ANTHROPOPHOBIAS
ANTHROPOPHOBICS ANTHROPOPHUISMS ANTHROPOPSYCHIC ANTHROPOSOPHIES
ANTHROPOSOPHIST ANTIALCOHOLISMS ANTIAPHRODISIAC ANTIARRHYTHMICS
ANTICHOLESTEROL ANTICHRISTIANLY ANTIDIARRHOEALS ANTIFASHIONABLE
ANTIHELMINTHICS ANTIHISTAMINICS ANTIMONARCHISTS ANTIPHLOGISTICS
ANTISHOPLIFTING ANTISYPHILITICS ANTITHROMBOTICS APHELIOTROPISMS
APOPHTHEGMATISE APOPHTHEGMATIST APOTHEGMATISING APPRENTICEHOODS
APPRENTICESHIPS ARACHNOIDITISES ARCHAEOBOTANIES ARCHAEOBOTANIST
ARCHAEOMETRISTS ARCHAEZOOLOGIES ARCHEOBOTANISTS ARCHEOMAGNETISM
ARCHEOZOOLOGIES ARCHEOZOOLOGIST ARCHGENETHLIACS ARCHIDIACONATES
ARCHIEPISCOPACY ARCHIEPISCOPATE ARCHPRIESTHOODS ARCHPRIESTSHIPS
AROMATHERAPISTS ARTERIOGRAPHIES ASTROPHYSICALLY ASTROPHYSICISTS
ATHEROSCLEROSIS ATHEROSCLEROTIC ATMOSPHERICALLY AUTHENTICATIONS
AUTOBIOGRAPHERS AUTOBIOGRAPHIES AUTORADIOGRAPHS AUTOSCHEDIASTIC
AUTOSCHEDIAZING AZIDOTHYMIDINES BACCHANALIANISM BACKSCRATCHINGS
BACTERIOPHAGIES BACTERIOPHAGOUS BALNEOTHERAPIES BATRACHOPHOBIAS
BIBLIOTHECARIES BIBLIOTHERAPIES BIGHEADEDNESSES BIOGEOCHEMICALS
BIOSTRATIGRAPHY BIPARTISANSHIPS BISPHOSPHONATES BLAMEWORTHINESS
BRACHIOSAURUSES BRACHISTOCHRONE BRACHYCEPHALICS BRACHYCEPHALIES
BRACHYCEPHALISM BRACHYDACTYLIES BRACHYDACTYLISM BRACHYDIAGONALS
BRACHYPINAKOIDS BRACHYTHERAPIES BRAUNSCHWEIGERS BREATHABILITIES
BREATHARIANISMS BRONCHODILATORS BRONCHOGRAPHIES BRONCHOSCOPICAL
CANTHAXANTHINES CATECHISTICALLY CATECHUMENSHIPS CATHETERISATION
CATHODOGRAPHIES CATHOLICISATION CERVICOGRAPHIES CHALCOGRAPHISTS
CHAMBERLAINSHIP CHANCELLORSHIPS CHANGEABILITIES CHANNELISATIONS
CHANNELIZATIONS CHANNELOPATHIES CHAPTALISATIONS CHAPTALIZATIONS
CHARACTERISABLE CHARACTERISTICS CHARGEABILITIES CHEMICOPHYSICAL
CHEMOPSYCHIATRY CHEMOTAXONOMIES CHEMOTAXONOMIST CHEMOTHERAPISTS
CHENOPODIACEOUS CHLORITISATIONS CHLORITIZATIONS CHLOROTHIAZIDES
CHLORPROMAZINES CHLORPROPAMIDES CHLORTHALIDONES CHOLESTEROLEMIA
CHOLESTYRAMINES CHOLINESTERASES CHONDRICHTHYANS CHONDROCRANIUMS
CHORIOALLANTOIS CHRESTOMATHICAL CHROMATICNESSES CHROMATOLOGISTS
CHROMOTHERAPIES CHRONOTHERAPIES CINCHONISATIONS CINCHONIZATIONS
CLAUSTROPHILIAS CLAUSTROPHOBIAS CLIMATOGRAPHIES COCHAIRMANSHIPS
COMMANDANTSHIPS COMMISSARYSHIPS COMPOTATIONSHIP COMPUTERPHOBIAS
CONSERVATORSHIP CONSULTANTSHIPS CORINTHIANISING COUNTERSHADINGS
CRASHWORTHINESS CRYPTAESTHESIAS CRYPTOGRAPHISTS CYBERCHONDRIACS
CYPROHEPTADINES CYTOPATHOLOGIES CYTOPATHOLOGIST DACTYLOGRAPHIES
DECHLORINATIONS DECHRISTIANISED DECHRISTIANISES DECHRISTIANIZED
DECHRISTIANIZES DEHUMANISATIONS DEHUMANIZATIONS DEHYPNOTISATION
DEPHLOGISTICATE DERMATOGLYPHICS DERMATOGRAPHIAS DERMATOGRAPHIES
DERMATOPHYTOSIS DESULPHURATIONS DETACHABILITIES DEXAMPHETAMINES
DIAHELIOTROPISM DIAPHOTOTROPIES DIAPHOTOTROPISM DIAPHRAGMATITIS
DIAPHRAGMITISES DIASTROPHICALLY DICHLOROETHANES DICHOTOMISATION
DICHROMATICISMS DIMENHYDRINATES DISACCHARIDASES DISENCHANTINGLY
DISENCHANTMENTS DISENFRANCHISED DISENFRANCHISES DISENTHRALLMENT
DISENTHRALMENTS DISESTABLISHING DISHABILITATING DISHABILITATION
DISHARMONIOUSLY DISHEARTENINGLY DISHEARTENMENTS DISINHERITANCES
DISINTHRALLINGS DISTINGUISHABLE DISTINGUISHABLY DOLICHOSAURUSES
DORSIBRANCHIATE DRAUGHTSMANSHIP DYSMORPHOPHOBIA EARTHSHATTERING
ECHINODERMATOUS ECHOCARDIOGRAMS ECTOMYCORRHIZAS EDRIOPHTHALMOUS
ELECTROGRAPHIES ELEUTHEROMANIAS ENANTIOMORPHIES ENANTIOMORPHISM
ENANTIOMORPHOUS ENCEPHALITOGENS ENCEPHALOTOMIES ENFRANCHISEMENT
ENHYPOSTATISING ENHYPOSTATIZING ENTEROHEPATITIS ENTHRONISATIONS
ENTHRONIZATIONS EPITHELIALISING EPITHELIOMATOUS EPITHELISATIONS
EPITHELIZATIONS ESOPHAGOSCOPIES ETHEREALISATION ETHERIFICATIONS
ETHNOHISTORIANS ETHNOHISTORICAL EUPHEMISTICALLY EUTROPHICATIONS
FAITHLESSNESSES FAITHWORTHINESS FARTHINGSWORTHS FASHIONABLENESS
FEATHERBEDDINGS FEATHERSTITCHED FEATHERSTITCHES FETISHISTICALLY
FOOLHARDINESSES GENETHLIALOGIES GEODEMOGRAPHICS GEOSTROPHICALLY
GLOSSOGRAPHICAL GRAPHICALNESSES GRAPHITISATIONS GRAPHITIZATIONS
HABITABLENESSES HAEMAGGLUTININS HALLUCINOGENICS HAMAMELIDACEOUS
HARMONISTICALLY HARPSICHORDISTS HEADMASTERLIEST HEADMASTERSHIPS
HEADMISTRESSIER HEARTSICKNESSES HEMAGGLUTINATES HEMICRYSTALLINE
HEMOCHROMATOSIS HEMOGLOBINURIAS HENDECASYLLABIC HEPARINISATIONS
HEPARINIZATIONS HEPATICOLOGISTS HEREDITARIANISM HEREDITARIANIST
HERESIOGRAPHERS HERESIOGRAPHIES HERESTHETICIANS HERMAPHRODITISM
HERNIORRHAPHIES HETEROSCEDASTIC HETEROSEXUALITY HETEROSOCIALITY
HETEROTHALLISMS HEXOSAMINIDASES HIBERNICISATION HIERACOSPHINGES
HIERACOSPHINXES HIEROGRAMMATIST HILARIOUSNESSES HISTOCHEMICALLY
HISTOCOMPATIBLE HISTOPATHOLOGIC HISTORIOGRAPHER HISTORIOGRAPHIC
HOLOBLASTICALLY HOLOCRYSTALLINE HOLOMETABOLISMS HOMOCHROMATISMS
HOMOGENISATIONS HOMOGENIZATIONS HOMOPLASTICALLY HOMOSEXUALITIES
HOMOSOCIALITIES HONOURABILITIES HORIZONTALITIES HOSPITALISATION
HOSPITALIZATION HUMANITARIANISM HUMANITARIANIST HUMIDIFICATIONS
HYDROCORALLINES HYDRODYNAMICIST HYDROGENISATION HYDROSTATICALLY
HYDROTHERAPISTS HYDROXYAPATITES HYGROSCOPICALLY HYLOZOISTICALLY
HYPERACTIVITIES HYPERADRENALISM HYPERAESTHESIAS HYPERAGGRESSIVE
HYPERCALCAEMIAS HYPERCATABOLISM HYPERFASTIDIOUS HYPERGLYCAEMIAS
HYPERINFLATIONS HYPERLIPIDEMIAS HYPERMETABOLISM HYPERNATRAEMIAS
HYPERPARASITISM HYPERPHYSICALLY HYPERPOLARISING HYPERSALINITIES
HYPERSALIVATION HYPERSTIMULATED HYPERSTIMULATES HYPERURICAEMIAS
HYPERVENTILATES HYPERVIGILANCES HYPNOTHERAPISTS HYPNOTISABILITY
HYPOCHONDRIASES HYPOCHONDRIASIS HYPOCHONDRIASMS HYPOCHONDRIASTS
HYPOCRYSTALLINE HYPOMAGNESAEMIA HYPOMAGNESEMIAS HYPOPITUITARISM
HYPOSTASISATION HYPOSTASIZATION HYPOSTATISATION HYPOSTATIZATION
HYPSOMETRICALLY ICHTHYOPHAGISTS ICHTHYOSAURIANS ICHTHYOSAURUSES
ICOSITETRAHEDRA IMMUNOTHERAPIES IMPERISHABILITY IMPOSTHUMATIONS
INAPPREHENSIBLE INAPPREHENSIONS INHARMONICITIES INHERITABLENESS
INHOSPITALITIES INTERBEHAVIOURS INTERSCHOLASTIC IONOSPHERICALLY
ISOTHIOCYANATES KINDHEARTEDNESS KINESITHERAPIES KINESTHETICALLY
LABYRINTHITISES LABYRINTHODONTS LEGISLATORSHIPS LEUCOCYTHAEMIAS
LEXICOGRAPHISTS LICENTIATESHIPS LIEUTENANTSHIPS LIGHTFASTNESSES
LIONHEARTEDNESS LISSENCEPHALIES LISSENCEPHALOUS LITHOCHROMATICS
LYMPHADENITISES LYMPHANGIOGRAMS LYOPHILISATIONS LYOPHILIZATIONS
MACHINABILITIES MACRENCEPHALIAS MACRENCEPHALIES MAGISTRATESHIPS
MARSHMALLOWIEST MASOCHISTICALLY MASSOTHERAPISTS MATHEMATICISING
MATHEMATISATION MATRIARCHALISMS MECHANISTICALLY MECHANOMORPHISM
MEGALOCEPHALIES MESATICEPHALIES MESATICEPHALOUS METABISULPHITES
METACHROMATISMS METALLOGRAPHIES METALLOGRAPHIST METAMATHEMATICS
METAPHYSICISING METAPHYSICIZING METHAEMOGLOBINS METHYLXANTHINES
MICROAEROPHILES MICROBAROGRAPHS MICROPHYSICALLY MISAPPREHENDING
MISAPPREHENSION MISAPPREHENSIVE MISCHARACTERISE MISCHARACTERIZE
MISSHAPENNESSES MONOCHROMATISMS MONOSACCHARIDES MORPHINOMANIACS
MULTICHARACTERS MULTITHREADINGS MUSICOTHERAPIES MYOCARDIOGRAPHS
MYTHOLOGISATION NANOPUBLISHINGS NEARSIGHTEDNESS NEOARSPHENAMINE
NEUROPSYCHIATRY NIGHTMARISHNESS NONACHIEVEMENTS NONCHARISMATICS
NONHISTORICALLY NONHOSPITALISED NONHOSPITALIZED NONHYSTERICALLY
NONPARTISANSHIP NONPARTIZANSHIP NONPSYCHIATRIST NONPSYCHOACTIVE
NONTHEISTICALLY NORTHEASTERLIES NOTHINGARIANISM NOTWITHSTANDING
NUDIBRANCHIATES OLIGOCYTHAEMIAS OLIGOSACCHARIDE OPHTHALMOLOGIES
OPHTHALMOLOGIST OPHTHALMOSCOPIC OPISTHOGNATHISM OPISTHOGNATHOUS
OPISTHOGRAPHIES ORCHESOGRAPHIES ORCHESTRATIONAL ORGANOCHLORINES
ORGANOGRAPHISTS ORGANOTHERAPIES ORTHOCHROMATISM ORTHOGONALISING
ORTHOGONALITIES ORTHOPSYCHIATRY OSCILLOGRAPHIES OSTEOARTHRITICS
OSTEOPATHICALLY OUTDOORSMANSHIP OVEREMPHASISING OVEREMPHASIZING
OVERENTHUSIASMS OVERHASTINESSES OXYHAEMOGLOBINS PACHYMENINGITIS
PALAEOGRAPHISTS PAMPHLETEERINGS PANOPHTHALMITIS PANTHEISTICALLY
PARASYMPATHETIC PARTHENOCARPIES PARTHENOGENESIS PATHOGENICITIES
PATHOPHYSIOLOGY PATRIARCHALISMS PEDAGOGUISHNESS PERIHEPATITISES
PERIPHERALITIES PERISHABILITIES PHALLOCENTRISMS PHANTASMAGORIAL
PHANTASMAGORIAS PHANTASMAGORIES PHANTASMALITIES PHARISAICALNESS
PHARMACEUTICALS PHARMACOGNOSIES PHARMACOGNOSIST PHARMACOGNOSTIC
PHARMACOLOGISTS PHARMACOPOEIANS PHARMACOPOEISTS PHARMACOPOLISTS
PHARYNGOLOGISTS PHARYNGOSCOPIES PHENAKISTOSCOPE PHENETHYLAMINES
PHENOBARBITONES PHENOMENALISING PHENOMENALISTIC PHENOMENALITIES
PHENYLTHIOUREAS PHILANTHROPISTS PHILANTHROPOIDS PHILOSOPHASTERS
PHILOSOPHICALLY PHLOGISTICATING PHONEMICISATION PHONETICISATION
PHOSPHATISATION PHOSPHATIZATION PHOSPHOCREATINE PHOSPHOCREATINS
PHOSPHORYLATING PHOSPHORYLATION PHOSPHORYLATIVE PHOTODISSOCIATE
PHOTODUPLICATES PHOTOELASTICITY PHOTOENGRAVINGS PHOTOIONISATION
PHOTOJOURNALISM PHOTOJOURNALIST PHOTOOXIDATIONS PHOTOTRANSISTOR
PHRASEMONGERING PHRASEOGRAPHIES PHTHALOCYANINES PHYLLOSILICATES
PHYSICOCHEMICAL PHYSIOGRAPHICAL PHYSIOLOGICALLY PHYSIOPATHOLOGY
PHYSIOTHERAPIES PHYSIOTHERAPIST PIGHEADEDNESSES PINHEADEDNESSES
PITHECANTHROPUS PLAGIOCEPHALIES PLAINCLOTHESMAN PLAINCLOTHESMEN
POLYARTHRITIDES POLYARTHRITISES POLYCHROMATISMS POLYSACCHARIDES
POLYSYNTHETICAL POSTHEMORRHAGIC POSTMASTERSHIPS PRAISEWORTHIEST
PREANAESTHETICS PREESTABLISHING PREHISTORICALLY PROBATIONERSHIP
PROCURATORSHIPS PROSOPOGRAPHIES PROTHONOTARIATS PROTOHISTORIANS
PROTOSPATHAIRES PROTOSPATHARIUS PSEPHOLOGICALLY PSEUDAESTHESIAS
PSEUDEPIGRAPHIC PSEUDEPIGRAPHON PSEUDOARTHROSIS PSILANTHROPISMS
PSILANTHROPISTS PSYCHEDELICALLY PSYCHIATRICALLY PSYCHOACOUSTICS
PSYCHOANALYSING PSYCHOANALYZING PSYCHOBIOGRAPHY PSYCHOCHEMICALS
PSYCHODELICALLY PSYCHOGENETICAL PSYCHOGENICALLY PSYCHOGERIATRIC
PSYCHOGRAPHICAL PSYCHOHISTORIAN PSYCHOLOGICALLY PSYCHOMETRICIAN
PSYCHOSEXUALITY PSYCHOTHERAPIES PSYCHOTHERAPIST PSYCHROMETRICAL
PTERYLOGRAPHIES PUNISHABILITIES PYRETOTHERAPIES PYROTECHNICIANS
RADICULOPATHIES RADIOAUTOGRAPHS RADIOPHOSPHORUS RADIOTELEGRAPHS
RADIOTELEPHONES RADIOTHERAPISTS REAUTHORISATION REESTABLISHMENT
REHABILITATIONS REHOSPITALISING REHOSPITALIZING REHUMANIZATIONS
REORCHESTRATING REORCHESTRATION RETHEORIZATIONS RHEUMATOLOGISTS
RHINENCEPHALONS RHINOSCLEROMATA RHYPAROGRAPHIES RIGHTABLENESSES
SACCHARIMETRIES SACCHARISATIONS SACCHARIZATIONS SACCHAROMETRIES
SADOMASOCHISTIC SAPROPHYTICALLY SCAPHOCEPHALICS SCAPHOCEPHALIES
SCAPHOCEPHALISM SCEUOPHYLACIUMS SCHEMATISATIONS SCHEMATIZATIONS
SCHILLERISATION SCHILLERIZATION SCHISTOSOMIASES SCHISTOSOMIASIS
SCHIZOAFFECTIVE SCHOLARLINESSES SCHOOLMASTERING SCHOOLMASTERISH
SCHOOLTEACHINGS SCLEROTHERAPIES SCRATCHBUILDERS SCRATCHBUILDING
SCRIMSHANDERING SEARCHABILITIES SEARCHINGNESSES SEAWORTHINESSES
SEISMOGRAPHICAL SELENOGRAPHICAL SELENOGRAPHISTS SEMILOGARITHMIC
SEMIPORNOGRAPHY SERVOMECHANICAL SERVOMECHANISMS SHERARDISATIONS
SHERARDIZATIONS SHILLYSHALLIERS SHILLYSHALLYING SHOCKUMENTARIES
SKETCHABILITIES SLEDGEHAMMERING SOCIOHISTORICAL SOPHISTICATEDLY
SOPHISTICATIONS SOUTHEASTERLIES SPECTROGRAPHIES SPEECHIFICATION
SPELEOTHERAPIES SPHAEROSIDERITE SPHERICALNESSES SPHEROIDISATION
SPHEROIDIZATION SPHYGMOGRAPHIES SPINTHARISCOPES SPIROCHAETAEMIA
SPLANCHNOLOGIES SPORANGIOPHORES SQUEAMISHNESSES STADHOLDERSHIPS
STADTHOLDERSHIP STANDOFFISHNESS STAPHYLOPLASTIC STEEPLECHASINGS
STEGANOGRAPHIES STEGANOGRAPHIST STEGOCEPHALIANS STEREOGRAPHICAL
STIGMATOPHILIAS STIGMATOPHILIST STOECHIOLOGICAL STOICHIOLOGICAL
STRAIGHTFORWARD STRAIGHTJACKETS STRATIGRAPHICAL STRATIGRAPHISTS
STRATOSPHERICAL STREPHOSYMBOLIA SULFAMETHAZINES SULPHACETAMIDES
SULPHANILAMIDES SULPHATHIAZOLES SULPHINPYRAZONE SULPHURISATIONS
SULPHURIZATIONS SUPERCARGOSHIPS SUPERHUMANISING SUPERHUMANITIES
SUPERHUMANIZING SYCOPHANTICALLY SYLLABOGRAPHIES SYMBOLOGRAPHIES
SYMMETROPHOBIAS SYMPATHECTOMIES SYMPATHETICALLY SYMPATHOMIMETIC
SYNARTHRODIALLY SYNCHRONISATION SYNCHRONISTICAL SYNCHRONIZATION
SYNECDOCHICALLY SYNTHESISATIONS SYNTHESIZATIONS SYNTHETISATIONS
SYNTHETIZATIONS TECHNICALNESSES TELAUTOGRAPHIES TETARTOHEDRISMS
THALASSOCRACIES THALASSOGRAPHIC THALATTOCRACIES THANATOGRAPHIES
THANKWORTHINESS THAUMATOLATRIES THEATRICALISING THEATRICALITIES
THEOLOGISATIONS THEOLOGIZATIONS THEOSOPHISTICAL THERIANTHROPISM
THERMAESTHESIAS THERMALISATIONS THERMALIZATIONS THERMOSTABILITY
THERMOTHERAPIES THICKHEADEDNESS THINKABLENESSES THORACOCENTESIS
THORACOPLASTIES THREMMATOLOGIES THROMBOPLASTINS TRAINSPOTTERISH
TRANSHISTORICAL TRICHINISATIONS TRICHINIZATIONS TRICHOMONACIDES
TRIHALOMETHANES TRIIODOMETHANES TRIMETHYLAMINES TRIPHENYLAMINES
TRISOCTAHEDRONS UNANAESTHETISED UNANAESTHETIZED UNAPPREHENSIBLE
UNCHRISTIANISED UNCHRISTIANISES UNCHRISTIANIZED UNCHRISTIANIZES
UNCHRISTIANLIKE UNDEREMPHASISED UNDEREMPHASISES UNDEREMPHASIZED
UNDEREMPHASIZES UNEARTHLINESSES UNHEALTHINESSES UNPHILOSOPHICAL
UNSEAWORTHINESS UNSHAPELINESSES UNSOPHISTICATED UNTHINKABLENESS
VAPOURISHNESSES WAPPENSCHAWINGS WEATHERISATIONS WEATHERIZATIONS
WEATHERLINESSES WHIMSICALNESSES WHIPPERSNAPPERS WITHDRAWNNESSES
ZINJANTHROPUSES ZYGOBRANCHIATES