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List of 15-letter words containing

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There are 16 fifteen-letter words containing 3E, O, 2P and S

EPHEMEROPTERANSephemeropterans n. Plural of ephemeropteran.
EPHEMEROPTERAN n. any insect of the mayfly family.
HYPERRESPONSIVEhyperresponsive adj. Involving an abnormally high degree of responsiveness.
HYPERRESPONSIVE adj. excessively responsive.
NOREPINEPHRINESnorepinephrines n. Plural of norepinephrine.
NOREPINEPHRINE n. (US) a neurotransmitter hormone related to adrenalin, produced by the adrenal glands.
OPPORTUNENESSESOPPORTUNENESS n. OPPORTUNE, happening at the right time.
PHOSPHORESCENCEphosphorescence n. The emission of light without any perceptible heat; the quality of being phosphorescent.
PHOSPHORESCENCE n. luminescence that continues after the source of excitation has been removed.
PHOTOTYPESETTERphototypesetter n. A machine used in phototypesetting.
phototypesetter n. One who phototypesets for their work.
PHOTOTYPESETTER n. one who does phototypesetting.
PREDEVELOPMENTSPREDEVELOPMENT n. a preliminary development.
PREPERFORMANCESpreperformances n. Plural of preperformance.
PREPONDERANCIESpreponderancies n. Plural of preponderancy.
PREPONDERANCY n. a superiority in weight, power, importance, or strength, also PREPONDERANCE.
PROSPECTIVENESSprospectiveness n. The quality of being prospective.
PROSPECTIVENESS n. the state of being prospective.
PSEUDOEPHEDRINEpseudoephedrine n. (Pharmacology) A sympathomimetic alkaloid commonly used as a decongestant; a chemical compound, an isomer…
PSEUDOEPHEDRINE n. a naturally occurring isomer of ephedrine, used in the form of its hydrochloride as a bronchodilator.
PURPOSELESSNESSpurposelessness n. The state of being purposeless.
PURPOSELESS n. having no purpose.
PURPOSIVENESSESpurposivenesses n. Plural of purposiveness.
PURPOSIVENESS n. PURPOSIVE, directed towards an end.
PYRETOTHERAPIESPYRETOTHERAPY n. medical treatment by causing fever.
SPELEOTHERAPIESSPELEOTHERAPY n. an alternative or complementary method of therapy for treating asthma and other respiratory diseases, involving periods spent underground in a salt mine.
SUPERPHENOMENONsuperphenomenon n. A phenomenon that exceeds normal phenomenal qualities, standards, etc.
SUPERPHENOMENON n. an exceptional phenomenon.

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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