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List of 15-letter words containing

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There are 20 fifteen-letter words containing E, L, N, O, 2P 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.
ENCEPHALOGRAPHSencephalographs n. Plural of encephalograph.
ENCEPHALOGRAPH n. an instrument for recording brain images.
EPISCOPALIANISMEpiscopalianism prop.n. The doctrines and practices of Episcopalians.
EPISCOPALIANISM n. the state of being episcopalian.
HYPERPOLARISINGhyperpolarising v. Present participle of hyperpolarise.
HYPERPOLARISE v. to increase the difference in electric potential across a cell membrane, also HYPERPOLARIZE.
MONOPROPELLANTSmonopropellants n. Plural of monopropellant.
MONOPROPELLANT n. a rocket propellant containing both the fuel and the oxidizer in a single substance.
NONPHILOSOPHERSnonphilosophers n. Plural of nonphilosopher.
NONPHILOSOPHER n. someone who is not a philosopher.
OVERPOPULATIONSoverpopulations n. Plural of overpopulation.
OVERPOPULATION n. population so dense as to cause environmental deterioration.
PLAINSPOKENNESSplainspokenness n. The quality of being plainspoken.
PLAINSPOKEN n. candid, frank.
POLYPHLOESBOEANpolyphloesboean adj. (Poetic) Loudly roaring; used to describe the ocean.
POLYPHLOESBOEAN adj. loud-roaring, also POLYPHLOISBIC.
PREDEVELOPMENTSPREDEVELOPMENT n. a preliminary development.
PREPOSITIONALLYprepositionally adv. In a prepositional manner.
prepositionally adv. As a preposition.
PREPOSITIONAL adv. relating to a preposition.
PREPOSSESSINGLYprepossessingly adv. In a prepossessing manner.
PREPOSSESSING adv. creating a favorable impression; attractive.
PREPROFESSIONALpreprofessional adj. Prior to starting a profession.
preprofessional n. One who is working towards becoming a professional.
PREPROFESSIONAL adj. of or relating to the period preceding specific study for or practice of a profession.
PREPUBLICATIONSprepublications n. Plural of prepublication.
PREPUBLICATION n. an advance publication.
PURPOSELESSNESSpurposelessness n. The state of being purposeless.
PURPOSELESS n. having no purpose.
SULPHINPYRAZONEsulphinpyrazone n. Alternative form of sulfinpyrazone.
SULPHINPYRAZONE n. a drug used to treat gout.
SUPPLEMENTATIONsupplementation n. The act of supplementing.
supplementation n. Something added as a supplement.
SUPPLEMENTATION n. the act of supplementing.
SUPPORTABLENESSsupportableness n. The state of being supportable.
SUPPORTABLENESS n. the state of being supportable.
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 WikWik.org and 1Word.ws.

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