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There are 5 fifteen-letter words containing A, 4O, P and 2T

PHOTOAUTOTROPHSphotoautotrophs n. Plural of photoautotroph.
PHOTOAUTOTROPH n. an organism capable of synthesizing its own food from inorganic substances using light as an energy source.
PHOTOIONISATIONphotoionisation n. (Physics) The ejection of electrons from an atom or other species following the absorption of photons.
PHOTOIONISATION n. ionization (as in the ionosphere) of a molecule or atom caused by absorption of radiant energy, also PHOTOIONIZATION.
PHOTOIONIZATIONphotoionization n. Alternative spelling of photoionisation.
PHOTOIONIZATION n. ionization (as in the ionosphere) of a molecule or atom caused by absorption of radiant energy, also PHOTOIONISATION.
PHOTOOXIDATIONSphotooxidations n. Plural of photooxidation.
PHOTOOXIDATION n. oxidation under the influence of radiant energy, as light.
PHOTOTOPOGRAPHYphototopography n. The surveying and mapping of a terrain based solely on terrestrial photographs.
PHOTOTOPOGRAPHY n. the preparation of topographic maps from photographs.

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 WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 49 words
  • Scrabble in French: 1 word
  • Scrabble in Spanish: 4 words
  • Scrabble in Italian: 13 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 14 words


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