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There are 14 fifteen-letter words containing H, 3O, 2P and 2T

ANTHROPOSOPHISTanthroposophist n. A proponent of anthroposophy.
ANTHROPOSOPHIST n. one versed in anthroposophy, knowledge of the nature of humanity.
ASTROPHOTOGRAPHastrophotograph n. Alternative form of astrophoto.
ASTROPHOTOGRAPH n. a photograph of a celestial body.
COMPOTATIONSHIPCOMPOTATIONSHIP n. being a drinking companion.
DIAPHOTOTROPIESDIAPHOTOTROPY n. the state of being diaphototropic, turning transversely to the light.
DIAPHOTOTROPISMDIAPHOTOTROPISM n. the state of being diaphototropic, turning transversely to the light.
ORTHOPHOSPHATESorthophosphates n. Plural of orthophosphate.
ORTHOPHOSPHATE n. a salt or ester of orthophosphoric acid.
PHOTOAUTOTROPHSphotoautotrophs n. Plural of photoautotroph.
PHOTOAUTOTROPH n. an organism capable of synthesizing its own food from inorganic substances using light as an energy source.
PHOTOLITHOGRAPHphotolithograph n. A lithograph made by photolithography.
photolithograph v. To produce (a picture or copy) by the process of photolithography.
PHOTOLITHOGRAPH n. a plate produced by photolithography.
PHOTOPRODUCTIONphotoproduction n. (Chemistry) The production of a molecular species (e.g. a radical or ion) by means of light.
PHOTOPRODUCTION n. the production of one or more particles by the action of an incident photon.
PHOTORECEPTIONSphotoreceptions n. Plural of photoreception.
PHOTORECEPTION n. the perception of waves in the range of visible light.
PHOTOTOPOGRAPHYphototopography n. The surveying and mapping of a terrain based solely on terrestrial photographs.
PHOTOTOPOGRAPHY n. the preparation of topographic maps from photographs.
PHOTOTROPICALLYphototropically adv. In a phototropic manner.
PHOTOTROPIC adv. relating to phototropism, movement directed by light.
PHOTOTYPOGRAPHYphototypography n. A photomechanical method of printing made to resemble traditional metal typography.
PHOTOTYPOGRAPHY n. any printing process involving the use of photography.
PYROPHOTOMETERSPYROPHOTOMETER n. a type of pyrometer in which the temperature of an incandescent body is determined by photometric measurement of the light it emits.

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: 76 words
  • Scrabble in French: 10 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: 1 word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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