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There are 3 fifteen-letter words containing H, I, 2N and 4O

PHOTOCONDUCTIONphotoconduction n. A change (normally an increase) in the electrical conductivity of a material as a result of incident…
PHOTOCONDUCTION n. conduction of electricity resulting from the absorption of light.
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.

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: 28 words
  • Scrabble in French: 1 word
  • Scrabble in Spanish: no word
  • Scrabble in Italian: 2 words
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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