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There are 7 thirteen-letter words containing H, 2O, P, R, 2T and U

CHEMAUTOTROPHCHEMAUTOTROPH n. an organism, such as a bacterium, that obtains its energy from inorganic reactions using simple compounds, such as ammonia or carbon dioxide.
HETEROPTEROUSheteropterous adj. (Zoology) Belonging or relating to the Heteroptera.
HETEROPTEROUS adj. of, relating to, or belonging to the Heteroptera, a suborder of hemipterous insects, including bedbugs, water bugs, etc., also HETEROPTERAN.
LUTEOTROPHINSluteotrophins n. Plural of luteotrophin.
LUTEOTROPHIN n. another name for the hormone prolactin, also LUTEOTROPIN.
PHOTOCURRENTSphotocurrents n. Plural of photocurrent.
PHOTOCURRENT n. a stream of electrons produced by photoelectric or photovoltaic effects.
PHOTONEUTRONSphotoneutrons n. Plural of photoneutron.
PHOTONEUTRON n. a neutron emitted from a nucleus as a result of photodisintegration.
PHOTOPRODUCTSphotoproducts n. Plural of photoproduct.
PHOTOPRODUCT n. a product of a photochemical reaction.
TRICHOPTEROUStrichopterous adj. (Zoology) Of, pertaining to, or characterizing the Trichoptera.
TRICHOPTEROUS adj. relating to the Trichoptera, caddis flies.

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: 45 words
  • Scrabble in French: 6 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: 1 word


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