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There are 5 twelve-letter words containing H, 2O, 3S, T and Y

HYPEROSTOSEShyperostoses n. Plural of hyperostosis.
HYPEROSTOSIS n. abnormal growth of bone tissue.
HYPEROSTOSIShyperostosis n. (Medicine) An excessive growth or thickening of bone.
HYPEROSTOSIS n. abnormal growth of bone tissue.
PHOTOSYSTEMSphotosystems n. Plural of photosystem.
PHOTOSYSTEM n. either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts.
PHYSOSTOMOUSphysostomous adj. (Zoology) Having a duct to the air bladder.
physostomous adj. (Zoology) Relating to the Physostomi.
PHYSOSTOMOUS adj. of fishes, having a duct connecting the air bladder to part of the alimentary canal.
SOOTHSAYINGSsoothsayings n. Plural of soothsaying.
SOOTHSAYING n. the act of divining.

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


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