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There are 10 thirteen-letter words containing H, I, 3O, 2P and R

COSPONSORSHIPcosponsorship n. Joint sponsorship by more than one party.
COSPONSORSHIP n. the state of being a cosponsor.
DIAPHOTOTROPYDIAPHOTOTROPY n. the state of being diaphototropic, turning transversely to the light.
MORPHOTROPIESMORPHOTROPY n. the effect on crystalline form of the addition or substitution of an element or radical.
OPHIOMORPHOUSophiomorphous adj. Having the form of a snake.
OPHIOMORPHOUS adj. snakelike, also OPHIOMORPHIC.
PHOTOPERIODICphotoperiodic adj. Of, pertaining to, or exhibiting photoperiodism.
PHOTOPERIODIC adj. relating to a photoperiod.
PHOTOPHORESISphotophoresis n. The slow drift of fine particles suspended in a gas away from a strong light source.
PHOTOPHORESIS n. migration of suspended particles under the influence of light.
PHOTOTROPISMSphototropisms n. Plural of phototropism.
PHOTOTROPISM n. movement directed by light.
PROTOTROPHIESprototrophies n. Plural of prototrophy.
PROTOTROPHY n. the state of being prototrophic.
SIPHONOPHORESsiphonophores n. Plural of siphonophore.
SIPHONOPHORE n. a marine creature, colonial in habit.
TROPHOTROPISMtrophotropism n. The movements of the organs in a growing plant, as towards nutrient substances, induced by the chemical…
TROPHOTROPISM n. direction of growth by nutritional factors.

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: 54 words
  • Scrabble in French: 10 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: 1 word
  • Scrabble in German: no word
  • Scrabble in Romanian: 4 words


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