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There are 16 fifteen-letter words containing H, I, 4O, P and S

GEOMORPHOLOGIESgeomorphologies n. Plural of geomorphology.
GEOMORPHOLOGY n. the study of the landscapes of the earth and their development.
GEOMORPHOLOGISTgeomorphologist n. A geologist whose speciality is geomorphology.
GEOMORPHOLOGIST n. one who studies geomorphology.
HOMOEOMORPHISMShomoeomorphisms n. Plural of homoeomorphism.
HOMOEOMORPHISM n. the state of being homoeomorphic.
OOPHORECTOMISEDoophorectomised v. Simple past tense and past participle of oophorectomise.
OOPHORECTOMISE v. to perform an oophorectomy, removal of one or both ovaries, also OOPHORECTOMIZE.
OOPHORECTOMISESOOPHORECTOMISE v. to perform an oophorectomy, removal of one or both ovaries, also OOPHORECTOMIZE.
OOPHORECTOMIZESOOPHORECTOMIZE v. to perform an oophorectomy, removal of one or both ovaries, also OOPHORECTOMISE.
ORTHOPHOSPHORICorthophosphoric adj. (Chemistry) Describing the ordinary form of phosphoric acid and its derivatives.
ORTHOPHOSPHORIC adj. phosphoric.
PHOTOBIOLOGISTSphotobiologists n. Plural of photobiologist.
PHOTOBIOLOGIST n. one who studies photobiology.
PHOTOGEOLOGISTSphotogeologists n. Plural of photogeologist.
PHOTOGEOLOGIST n. one who studies photogeology.
PHOTOIONISATIONphotoionisation n. (Physics) The ejection of electrons from an atom or other species following the absorption of photons.
PHOTOIONISATION n. ionization (as in the ionosphere) of a molecule or atom caused by absorption of radiant energy, also PHOTOIONIZATION.
PHOTOOXIDATIONSphotooxidations n. Plural of photooxidation.
PHOTOOXIDATION n. oxidation under the influence of radiant energy, as light.
PSYCHOSOCIOLOGYpsychosociology n. The study of psychosocial development.
PSYCHOSOCIOLOGY n. the study of how psychological and sociological factors combine.
ZOOPHYSIOLOGIESZOOPHYSIOLOGY n. the study of animal physiology.
ZOOPHYSIOLOGISTzoophysiologist n. One who studies zoophysiology.
ZOOPHYSIOLOGIST n. a student of animal physiology.
ZOOPHYTOLOGISTSzoophytologists n. Plural of zoophytologist.
ZOOPHYTOLOGIST n. one who studies zoophytes.
ZOOPSYCHOLOGIESzoöpsychologies n. Plural of zoöpsychology.
ZOOPSYCHOLOGY n. the psychology of the lower animals.

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: 67 words
  • Scrabble in French: 8 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: 12 words


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