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There are 11 fifteen-letter words containing I, O, 4S, T and Y

ASTROPHYSICISTSastrophysicists n. Plural of astrophysicist.
ASTROPHYSICIST n. a student of astrophysics.
BIOSYSTEMATISTSbiosystematists n. Plural of biosystematist.
BIOSYSTEMATIST n. one who studies biosystematics.
IMMUNOASSAYISTSIMMUNOASSAYIST n. one who carries out immunoassays.
POLYSYNTHESISMSPOLYSYNTHESISM n. the state of being polysynthetic.
PSYCHOSYNTHESISpsychosynthesis n. A form of psychology based on the direct experience of the self.
PSYCHOSYNTHESIS n. a form of psychotherapy combining psychoanalytic techniques with meditation and exercise.
PYCNODYSOSTOSISpycnodysostosis n. (Medicine) A genetic disorder characterized by dense, fragile bones and dwarfism.
PYCNODYSOSTOSIS n. a rare inherited bone disease characterized by short stature and thickening and fragility of the bones.
PYKNODYSOSTOSISpyknodysostosis n. Alternative form of pycnodysostosis.
PYKNODYSOSTOSIS n. a rare inherited bone disease characterized by short stature and thickening and fragility of the bones.
SCHOOLMISTRESSYschoolmistressy adj. Resembling or characteristic of a schoolmistress.
SCHOOLMISTRESSY adj. like a schoolmistress, prim.
SYNAPOSEMATISMSSYNAPOSEMATISM n. warning coloration common to many species in region.
SYNTHESISATIONSSYNTHESISATION n. the process of synthesising, also SYNTHESIZATION.
TOMBOYISHNESSESTOMBOYISHNESS n. the state of being tomboyish.

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


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