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There are 8 fifteen-letter words containing H, 2I, N, 3O and P

COMPOTATIONSHIPCOMPOTATIONSHIP n. being a drinking companion.
CORTICOTROPHINScorticotrophins n. Plural of corticotrophin.
CORTICOTROPHIN n. a hormone that stimulates the adrenal gland, also CORTICOTROPIN.
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.
PHOTOINDUCTIONSphotoinductions n. Plural of photoinduction.
PHOTOINDUCTION n. induction by the effect 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.
PHOTOOXIDATIONSphotooxidations n. Plural of photooxidation.
PHOTOOXIDATION n. oxidation under the influence of radiant energy, as light.
PROTOHISTORIANSprotohistorians n. Plural of protohistorian.
PROTOHISTORIAN n. one who studies protohistory.

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: 84 words
  • Scrabble in French: 10 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: 4 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 17 words


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