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List of 12-letter words containing

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There are 6 twelve-letter words containing H, M, O, 3S and Y

HYOSCYAMUSEShyoscyamuses n. Plural of hyoscyamus.
HYOSCYAMUS n. any plant of the solanaceous genus Hyoscyamus, including henbane.
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.
SCYPHISTOMASscyphistomas n. Plural of scyphistoma.
SCYPHISTOMA n. the fixed polypoid stage in the life cycle of a scyphozoan, which reproduces asexually by budding or strobilation.
SYMPOSIARCHSsymposiarchs n. Plural of symposiarch.
SYMPOSIARCH n. the master, director, etc. of a feast or conference.
SYNCHRONISMSsynchronisms n. Plural of synchronism.
SYNCHRONISM n. the state of being synchronous.

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: 21 words
  • Scrabble in French: 6 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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