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There are 13 fifteen-letter words containing A, C, H, M, N, O, S and Y

ACTINOCHEMISTRYactinochemistry n. The science of chemistry and actinism.
ACTINOCHEMISTRY n. another name for photochemistry.
ARCHEOASTRONOMYarcheoastronomy n. Alternative spelling of archaeastronomy.
ARCHEOASTRONOMY n. the scientific study of the beliefs and practices concerning astronomy that existed in ancient and prehistoric civilizations.
CHLAMYDOMONADESCHLAMYDOMONAS n. a member of the genus Chlamydomonas of (mainly freshwater) green algae.
CHOLESTYRAMINEScholestyramines n. Plural of cholestyramine.
CHOLESTYRAMINE n. a strongly basic synthetic resin that forms insoluble complexes with bile acids and has been used to lower cholesterol levels in hypercholesterolemic patients.
COLLENCHYMATOUScollenchymatous adj. Relating to collenchyma.
COLLENCHYMATOUS adj. relating to collenchyma.
HARMONISTICALLYharmonistically adv. In a harmonistic manner.
HARMONISTIC adv. relating to harmony.
HYDRODYNAMICISThydrodynamicist n. One who studies hydrodynamics.
HYDRODYNAMICIST n. a student of hydrodynamics.
HYPOCHONDRIASMSHYPOCHONDRIASM n. hypochondria.
MONOCHLAMYDEOUSmonochlamydeous adj. (Botany) Having a single floral envelope, that is, a calyx without a corolla, or, possibly, in rare…
MONOCHLAMYDEOUS adj. having a one-whorled perianth.
MYELENCEPHALONSMYELENCEPHALON n. the posterior part of the developing vertebrate hindbrain or the corresponding part of the adult brain composed of the medulla oblongata.
PROSENCHYMATOUSprosenchymatous adj. Relating to the prosenchyma.
PROSENCHYMATOUS adj. relating to prosenchyma, supporting plant tissue containing little protoplasm.
PSYCHOMETRICIANpsychometrician n. (Psychology) A person who administers psychometric tests.
PSYCHOMETRICIAN n. a person (as a clinical psychologist) who is skilled in the administration and interpretation of objective psychological tests.
SARCENCHYMATOUSsarcenchymatous adj. Relating to sarcenchyme.
SARCENCHYMATOUS adj. of or like a sarcenchyme, a soft tissue of sponges with close-packed cells and reduced gelatinous matrix.

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: 95 words
  • Scrabble in French: 8 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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