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There are 520 eighteen-letter words containing 4O and R

adenocorticotropicAfricoon-Americoons Africoon␣AmericoonsagrometeorologicalagrometeorologistsAlexandrov␣topologyallegro␣ma␣non␣troppoaminochronologicalanthropobiologicalanthropobiologistsanthropomorphologyanthropomorphouslyanthroposomatologyanthropotechnologyany␣old␣nook␣or␣crannyarrowtooth␣flounderassal␣horizontologyastrochronologicalastrometeorologistautoanthropologiesautoprotonizationsautoregulatory␣loopbeat␣Jack␣out␣of␣doorsbioanthropologicalbioanthropologistsbiochronologicallybiological␣controlsblorbos␣from␣my␣showsblown␣someone's␣coverblows␣someone's␣coverBononian␣phosphorusBook␣of␣Common␣Prayerbored␣out␣of␣one's␣mindbored␣out␣of␣one's␣treeBoston␣round␣bottlesbottom␣of␣the␣harbourbromoacetophenonesbromobenzotriazolebromochloromethanebromochloropropanebromofluoromethanebronchioloalveolarbronchoconstrictorbronchoprovocationbronchoprovocativebronchovideoscopesbrown␣woolly␣monkeyscarbon␣monofluoridechemoorganotrophicchemosomatosensorychloroacetophenonechlorocholesterolschlorofluorocarbonchloroformizationschlorohydrocarbonschlorophototrophicchloropyromorphitechloroquinolinoneschlorosulfonationschondrodystrophoidchondromyxosarcomachondroprogenitorschoriogonadotropinChorleywood␣processchromocollographicchromophotographicchromosomatisationchromosomatizationchronobiologicallychronomentrophobiachronopharmacologychronophotographicchronopotentiogramcoccolithophoridesColnbrook␣with␣PoyleColorado␣brown␣stainColorado␣River␣toadscolour␣coordinationcoloured␣revolutioncolpohysterotomiescome␣from␣a␣good␣placecommon␣denominatorscomparison␣operatorcompound␣microscopecompound␣proportioncomproportionatingcomproportionationconfocal␣microscopyconfront␣one's␣demonsConwy␣County␣Boroughcopromicroscopicalcopromycetophagouscoproparasitologiccoproparasitoscopycoproporphyrinogencoronary␣thrombosiscorpus␣calloscotomycorticomelanotrophcorticomotoneuronscosmochronologicalcotylomicrocercouscounteroppositionscounterorthodoxiescounterpropositioncrossed␣loop␣sensorscry␣from␣the␣rooftopsdarken␣someone's␣doorde␣facto␣corporationdendrochronologistdeoxyfluoroglucosedeuteriochloroformdichloroindophenoldiiodohydroquinonedisproportionationdithiolopyrrolonesDoctor␣of␣Philosophydoing␣somebody␣wrongdolichomacrostomiddo␣more␣harm␣than␣gooddorsal␣body␣hormonesdorsal␣root␣gangliondo␣someone␣one␣betterdo␣you␣come␣here␣oftendrop␣a␣dime␣on␣someonedrop␣like␣a␣hot␣potatoduodenoenterostomyecohydrogeomorphicecomorphologicallyelectroendoosmosiselectrotopologicalendocrinopathologyentomonecrophagousethnochoreologicalethnochoreologistsethnoornithologistexterosensorimotorfactor␣of␣productionfibrobronchoscopesfibrobronchoscopicflourodeoxyglucosefluorochlorosilane

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