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There are 17 fifteen-letter words containing H, P, 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.
CEPHALOTHORAXEScephalothoraxes n. Plural of cephalothorax.
CEPHALOTHORAX n. the body, or head with thorax, of spiders, crustaceans, etc.
DEXAMPHETAMINESDEXAMPHETAMINE n. the dextrorotatory isomer of amphetamine, used as a stimulant.
HYDROXYAPATITEShydroxyapatites n. Plural of hydroxyapatite.
HYDROXYAPATITE n. a complex phosphate of calcium that occurs as a mineral and is the chief structural element of vertebrate bone.
HYDROXYLAPATITEhydroxylapatite n. Alternative spelling of hydroxyapatite.
HYDROXYLAPATITE n. a mineral of the apatite group that is rare in the ground but is the principal inorganic constituent of tooth enamel and bone.
HYPEREXCITEMENThyperexcitement n. A state of very high excitement.
HYPEREXCITEMENT n. the state of being hyperexcited.
HYPEREXCRETIONSHYPEREXCRETION n. excessive excretion.
HYPEREXTENSIONShyperextensions n. Plural of hyperextension.
HYPEREXTENSION n. the extension of a joint beyond its normal range.
LEXICOGRAPHISTSlexicographists n. Plural of lexicographist.
LEXICOGRAPHIST n. one who makes dictionaries.
OXYPHENBUTAZONEoxyphenbutazone n. (Pharmacology) A metabolite of phenylbutazone.
OXYPHENBUTAZONE n. a phenylbutazone derivative having antiinflammatory, analgesic, and antipyretic effects.
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.
PHOTOOXIDATIONSphotooxidations n. Plural of photooxidation.
PHOTOOXIDATION n. oxidation under the influence of radiant energy, as light.
PHOTOTOXICITIESphototoxicities n. Plural of phototoxicity.
PHOTOTOXICITY n. the state of being phototoxic.
PHOTOXYLOGRAPHYphotoxylography n. A process in which a photograph is printed on wood to use as a template for engraving.
PHOTOXYLOGRAPHY n. wood engraving after a photographic impression on a woodblock.
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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See this list for:

  • English Wiktionary: 172 words
  • Scrabble in French: 5 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: 3 words


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