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There are 18 thirteen-letter words containing H, 3O, P, S and 2T

HOMOEOPATHISThomoeopathist n. Alternative form of homeopathist.
homœopathist n. Obsolete form of homeopathist.
HOMOEOPATHIST n. one who practises homoeopathy, also HOMEOPATH, HOMEOPATHIST, HOMOEOPATH.
OPISTHOSOMATAopisthosomata n. Plural of opisthosoma.
OPISTHOSOMA n. the abdomen of a spider or other arachnid.
ORTHOPTEROIDSorthopteroids n. Plural of orthopteroid.
ORTHOPTEROID n. a member of the Orthoptera, cockroaches.
ORTHOTROPISMSORTHOTROPISM n. vertical growth.
PHOTOCATHODESphotocathodes n. Plural of photocathode.
PHOTOCATHODE n. a cathode that emits electrons when exposed to radiant energy and esp. light.
PHOTOMONTAGESphotomontages n. Plural of photomontage.
PHOTOMONTAGE n. montage using photographic images.
PHOTONEUTRONSphotoneutrons n. Plural of photoneutron.
PHOTONEUTRON n. a neutron emitted from a nucleus as a result of photodisintegration.
PHOTOPOSITIVEphotopositive adj. (Biology) having a positive phototropic or phototactic response; attracted by light.
PHOTOPOSITIVE adj. exhibiting positive phototropism or phototaxis.
PHOTOPRODUCTSphotoproducts n. Plural of photoproduct.
PHOTOPRODUCT n. a product of a photochemical reaction.
PHOTOTROPISMSphototropisms n. Plural of phototropism.
PHOTOTROPISM n. movement directed by light.
PHOTOVOLTAICSphotovoltaics n. (Physics) The technology of the conversion of sunlight into electricity using semiconductors that exhibit…
PHOTOVOLTAICS n. the science and technology of photovoltaic devices and substances.
POSTHOLOCAUSTpostholocaust adj. After the Holocaust.
POSTHOLOCAUST adj. following the Holocaust.
PROSTHODONTIAPROSTHODONTIA n. the provision of false teeth, also PROSTHODONTICS.
PROTOHISTORICprotohistoric adj. Of or pertaining to protohistory.
PROTOHISTORIC adj. relating to protohistory.
PROTOTROPHIESprototrophies n. Plural of prototrophy.
PROTOTROPHY n. the state of being prototrophic.
SOMATOTROPHICsomatotrophic adj. That stimulates body growth, especially by producing somatotrophin.
SOMATOTROPHIC adj. promoting bodily growth, also SOMATOTROPIC.
SOMATOTROPHINsomatotrophin n. Alternative spelling of somatotropin.
SOMATOTROPHIN n. a polypeptide growth hormone, also SOMATOTROPIN, SOMATOTROPINE.
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: 64 words
  • Scrabble in French: 10 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: 2 words
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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