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There are 18 fifteen-letter words containing E, L, 3O, P, R and S

APOLIPOPROTEINSapolipoproteins n. Plural of apolipoprotein.
APOLIPOPROTEIN n. a protein that combines with a lipid to form a lipoprotein.
COUNTERPROPOSALcounterproposal n. A proposal made as an alternative to another, earlier proposal.
counter-proposal n. Alternative form of counterproposal.
COUNTERPROPOSAL n. a return proposal made by one who has rejected a proposal.
CRYPTOZOOLOGIESCRYPTOZOOLOGY n. the study of and search for animals and esp. legendary animals.
FLUOROPHOSPHATEfluorophosphate n. (Inorganic chemistry) The anion PO3F2- formed by replacing one hydroxyl of a phosphate anion with a…
fluorophosphate n. (Organic chemistry) The functional group >PO3F formed by replacing one hydroxyl of a phosphate group…
FLUOROPHOSPHATE n. a mineral compound of fluorine and phosphorus.
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.
MONOPROPELLANTSmonopropellants n. Plural of monopropellant.
MONOPROPELLANT n. a rocket propellant containing both the fuel and the oxidizer in a single substance.
NEUROPHYSIOLOGYneurophysiology n. (Physiology, neuroscience) The branch of physiology that deals with the nervous system.
NEUROPHYSIOLOGY n. the physiology of the nervous system.
NEUROPSYCHOLOGYneuropsychology n. A branch of neurology and of clinical psychology that investigates the physiological basis of psychological processes.
neuropsychology n. The facts uncovered thereby, or the body of knowledge thus produced.
NEUROPSYCHOLOGY n. the study of the relation between brain and behaviour.
NONPHILOSOPHERSnonphilosophers n. Plural of nonphilosopher.
NONPHILOSOPHER n. someone who is not a philosopher.
NONPROFESSIONALnonprofessional adj. Not professional; amateur.
nonprofessional n. One who is not a professional; an amateur.
non-professional adj. Alternative form of nonprofessional.
NONPROFESSORIALnonprofessorial adj. Not professorial.
NONPROFESSORIAL adj. not professorial.
OPTOELECTRONICSoptoelectronics n. (Physics) The branch of physics that deals with the interaction of light with electronic devices, or…
OPTOELECTRONICS n. a branch of electronics that deals with electronic devices for emitting, modulating, transmitting, and sensing light.
ORNITHODELPHOUSORNITHODELPHOUS adj. of or like the Ornithodelphia, monotremes, also ORNITHODELPHIAN, ORNITHODELPHIC.
OVERPOPULATIONSoverpopulations n. Plural of overpopulation.
OVERPOPULATION n. population so dense as to cause environmental deterioration.
PHOTOELECTRODESphotoelectrodes n. Plural of photoelectrode.
PHOTOELECTRODE n. an electrode which can exhibit photoelectricity.
SCOLOPENDRIFORMscolopendriform adj. Resembling the centipedes of the genus Scolopendra.
SCOLOPENDRIFORM adj. having the form of a centipede.
SPIRONOLACTONESspironolactones n. Plural of spironolactone.
SPIRONOLACTONE n. a synthetic corticosteroid drug used in the treatment of hypertension and as a diuretic.

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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See this list for:

  • English Wiktionary: 226 words
  • Scrabble in French: 28 words
  • Scrabble in Spanish: 39 words
  • Scrabble in Italian: 49 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 144 words


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