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There are 962 eighteen-letter words containing A, H, I, N, 2O and R

(page 6)

photoantimicrobialphotochlorinationsphotochronographicphotocrosslinkablephotodecolourationphotodeteriorationphotodisintegratedphotodisintegratesphotodocumentariesphotofermentationsphotofragmentationphotogravitationalphotoimmunotherapyphotoincorporationphotointermediatesphotoisomerisationphotoisomerizationphotolithographingphotomicrographingphotoorganotrophicphotoperoxidationsphotoperturbationsphotoprecipitationphotorecombinationphotoregenerationsphotosterilizationphototriangulationphrasal␣prepositionphycoerythrocyaninphylotranscriptomephytoplanktivorousplainclothespersonplastohydroquinoneplatinochloric␣acidPointe␣Coupee␣Parishpolydolopimorphianpolyendocrinopathypolygon-circle␣graphpolysomnographicalpolysomnographistspolysporangiophyteportal␣hypertensionpostbronchodilatorpostrehabilitationpour␣honey␣in␣one's␣earprehospitalizationprephosphorylatingprephosphorylationpresynchronizationprinter's␣apostropheprolymphangiogenicproofs␣by␣exhaustionprotease␣inhibitorsproteocephalideansprotoanthophylliteprotomitochondrialpro-vice-chancellorspseudohyponatremiapseudopornographicpsychoneurologicalpsychoneuroticallypteromerhanophobiaptilochronologicalput␣hair␣on␣one's␣chestpyranoanthocyaninspyrophosphokinasesquasimonochromaticquasisynchronouslyradiculoneuropathyradiochromatoscansradiochronologicalradiocinematographradiohalogenationsradiohumeral␣jointsradioimmunotherapyraised␣someone's␣shagraises␣someone's␣shagraking␣over␣the␣coalsread␣someone␣to␣filthreality␣pornographyreaping␣what␣one␣sowsrecatholicizationsrechromatographingrehospitalisationsrehospitalizationsrenohistopathologyrephosphorylationsresidential␣schoolsresynchronisationsresynchronizationsretinohypothalamicretinovasculopathyrhamnogalacturonicrhamnosylglucosiderhamnosylglycosiderheofluidificationrhetorical␣questionrhinolaryngoscopesrhinoseptoplastiesrhizocompartmentalrhombidodecahedronrhombitrihexagonalRichardson's␣theoremRichmond␣upon␣ThamesRobinson␣arithmeticroentgenotherapistround-lobed␣hepaticarule␣with␣a␣rod␣of␣ironsaccopharyngiformssail␣on␣another␣boardSaint␣Anthony's␣crossSakharov␣conditionssalpingooophoritis salpingo-oophoritissaurornitholestineScarborough␣warningschool-dinner␣ladies school␣dinner␣ladiesscimitar-horned␣oryxScotch␣marine␣boilerscratch␣one's␣own␣itchsecondary␣phosphineseismochronographssemi-boarding␣schoolsensoribehaviouralseptorhinoplastiessets␣one's␣hair␣on␣fireshit␣or␣get␣off␣the␣canshoving␣it␣up␣your␣asssocial␣anthropologysoda␣fountain␣chairssomatoparaphreniassonosalpingographysonospectrographicsopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesSouthern␣CaliforniaSouth␣Low␣Franconiansouthward␣equinoxessowing␣dragon's␣teethspirits␣of␣hartshornspirocycloheptanes

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