List of 13-letter words containing ••••••

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There are 16 thirteen-letter words containing 2H, M, N, 2O and S

AUTOCHTHONISM	• autochthonism n. The state of being autochthonal. • AUTOCHTHONISM n. the condition of being autochthonous.
HARMONICHORDS	• harmonichords n. Plural of harmonichord. • HARMONICHORD n. a keyboard instrument of violin tone, in which the strings are rubbed by rosined wheels.
HARMONIPHONES	• harmoniphones n. Plural of harmoniphone. • HARMONIPHONE n. a keyboard wind instrument with reeds, also HARMONIPHON.
HARMONOGRAPHS	• harmonographs n. Plural of harmonograph. • HARMONOGRAPH n. an instrument for drawing curves representing vibrations.
HOMEOWNERSHIP	• homeownership n. The state of being a homeowner. • home␣ownership n. The ownership of a home, (or collectively) homes. • home␣ownership n. The situation of owning one’s home.
HOMESCHOOLING	• homeschooling n. Teaching children at home instead of sending them to school. • home␣schooling v. Present participle of home school. • HOMESCHOOL v. to teach school subjects to one's children at home.
MONOPHOSPHATE	• monophosphate n. (Chemistry) any compound containing a single phosphate unit. • MONOPHOSPHATE n. an ester of phosphoric acid.
ORNITHOMORPHS	• ornithomorphs n. Plural of ornithomorph. • ORNITHOMORPH n. a figure or design in the form of a bird.
ORTHOGNATHISM	• orthognathism n. (Anatomy) The quality of being orthognathous. • ORTHOGNATHISM n. the state of having straight jaws.
PHOTOMACHINES	• PHOTOMACHINE n. a machine that prints copies of digital photographs.
PHYTOHORMONES	• phytohormones n. Plural of phytohormone. • PHYTOHORMONE n. a plant hormone, regulating growth.
PYTHONOMORPHS	• pythonomorphs n. Plural of pythonomorph. • PYTHONOMORPH n. a large marine reptile of the Cretaceous period, with long, scaly body and paddle-shaped limbs.
RHOMBOHEDRONS	• rhombohedrons n. Plural of rhombohedron. • RHOMBOHEDRON n. a parallelepiped whose faces are rhombuses.
SPHYGMOPHONES	• sphygmophones n. Plural of sphygmophone. • SPHYGMOPHONE n. an instrument for hearing the pulse.
THERMOSIPHONS	• thermosiphons n. Plural of thermosiphon. • THERMOSIPHON n. a method of circulating a cooling liquid through a system by using the slight difference in density between the hot and cool parts.
XANTHOCHROISM	• xanthochroism n. Alternative form of xanthochromism. • XANTHOCHROISM n. a condition in which all skin pigments except yellow disappear.

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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English Wiktionary: 67 words
Scrabble in French: 5 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 2 words

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