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There are 19 fifteen-letter words containing C, H, T and X

ARCHAEOPTERYXESarchaeopteryxes n. Plural of archaeopteryx.
ARCHAEOPTERYX n. a Jurassic fossil bird of the Archaeopteryx genus, with a long bony tail, sharp-toothed jaws, and wings bearing three clawed digits.
CANTHAXANTHINESCANTHAXANTHINE n. a naturally occurring carotenoid used esp. as a color additive for food, also CANTHAXANTHIN.
CEPHALOTHORAXEScephalothoraxes n. Plural of cephalothorax.
CEPHALOTHORAX n. the body, or head with thorax, of spiders, crustaceans, etc.
CHEMOTAXONOMIESchemotaxonomies n. Plural of chemotaxonomy.
CHEMOTAXONOMY n. the classification of plants and animals based on similarities and differences in biochemical composition.
CHEMOTAXONOMISTchemotaxonomist n. One who studies chemotaxonomy.
CHEMOTAXONOMIST n. one who practises chemotaxonomy.
EXCHANGEABILITYexchangeability n. The condition of being exchangeable.
EXCHANGEABILITY n. the state of being exchangeable.
EXHIBITIONISTICexhibitionistic adj. Having a tendency toward exhibitionism.
EXHIBITIONISTIC adj. characterised by exhibitionism.
EXOERYTHROCYTICexoerythrocytic adj. Outside of an erythrocyte.
EXOERYTHROCYTIC adj. occurring outside the red blood cells.
EXOTHERMICITIESexothermicities n. Plural of exothermicity.
EXOTHERMICITY n. the state of being exothermic.
HEXACHLORETHANEhexachlorethane n. Alternative form of hexachloroethane.
HEXACHLORETHANE n. a toxic crystalline compound used in smoke bombs.
HYDROEXTRACTORShydroextractors n. Plural of hydroextractor.
HYDROEXTRACTOR n. a drying machine that works centrifugally.
HYPEREXCITEMENThyperexcitement n. A state of very high excitement.
HYPEREXCITEMENT n. the state of being hyperexcited.
HYPEREXCRETIONSHYPEREXCRETION n. excessive excretion.
LEXICOGRAPHISTSlexicographists n. Plural of lexicographist.
LEXICOGRAPHIST n. one who makes dictionaries.
PHOTOEXCITATIONphotoexcitation n. (Chemistry) The formation of an excited state by the absorption of a photon.
PHOTOEXCITATION n. the process of exciting the atoms or molecules of a substance by the absorption of radiant energy.
PHOTOTOXICITIESphototoxicities n. Plural of phototoxicity.
PHOTOTOXICITY n. the state of being phototoxic.
PHYTOTOXICITIESphytotoxicities n. Plural of phytotoxicity.
PHYTOTOXICITY n. the state of being phytotoxic.
PSYCHOSEXUALITYpsychosexuality n. The psychological aspects of sexuality.
PSYCHOSEXUALITY n. the psychic factors of sex.
XYLOTYPOGRAPHICxylotypographic adj. Of or pertaining to xylotypography.
XYLOTYPOGRAPHIC adj. relating to, or printed from, wooden type.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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