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There are 13 fifteen-letter words containing 2I, O, P and 4S

ASTROPHYSICISTSastrophysicists n. Plural of astrophysicist.
ASTROPHYSICIST n. a student of astrophysics.
COMMISSARYSHIPScommissaryships n. Plural of commissaryship.
COMMISSARYSHIP n. the office of commissary.
FISSIPAROUSNESSfissiparousness n. The quality of being fissiparous.
FISSIPAROUS n. producing new biological units or individuals by fission, as with most strains of bacteria.
IMPASSIONEDNESSimpassionedness n. The quality of being impassioned.
IMPASSIONEDNESS n. the state of being impassioned.
IMPERIOUSNESSESimperiousnesses n. Plural of imperiousness.
IMPERIOUSNESS n. IMPERIOUS, assuming command; haughty.
PHOTOSENSITISESphotosensitises v. Third-person singular simple present indicative form of photosensitise.
PHOTOSENSITISE v. to make photosensitive by chemical or other means, also PHOTOSENSITIZE.
PRESSURISATIONSpressurisations n. Plural of pressurisation.
PRESSURISATION n. the act of pressurising, also PRESSURIZATION.
PRESTIGIOUSNESSprestigiousness n. The state or condition of being prestigious.
PRESTIGIOUSNESS n. the state of being prestigious.
PROGRESSIONISMSPROGRESSIONISM n. sympathy with or advocacy of progress; belief that social or other evolution is towards higher or better things.
PROGRESSIONISTSprogressionists n. Plural of progressionist.
PROGRESSIONIST n. a supporter of progressionism.
SPIRITOUSNESSESSPIRITOUSNESS n. the state of being spiritous.
SUPERVISORSHIPSsupervisorships n. Plural of supervisorship.
SUPERVISORSHIP n. the office of supervisor.
SUPPOSITIONLESSSUPPOSITIONLESS adj. without supposition.

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: 40 words
  • Scrabble in French: 95 words
  • Scrabble in Spanish: 8 words
  • Scrabble in Italian: 31 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 1 word


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