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There are 20 thirteen-letter words containing I, 3O, P, 2R and S

BIOPROSPECTORbioprospector n. One who engages in bioprospecting.
COCONSPIRATORcoconspirator n. Alternative spelling of co-conspirator.
co-conspirator n. A person involved with others in a conspiracy.
COCONSPIRATOR n. a joint conspirator.
COPROPRIETORScoproprietors n. Plural of coproprietor.
COPROPRIETOR n. a joint proprietor.
DISPROPORTIONdisproportion n. The state of being out of proportion; an abnormal or improper ratio; an imbalance.
disproportion n. Lack of suitableness, adequacy, or due proportion to an end or use; unsuitableness.
disproportion v. (Transitive) To make unsuitable in quantity, form, or fitness; to violate symmetry in; to mismatch.
INCORPORATORSincorporators n. Plural of incorporator.
INCORPORATOR n. one who incorporates.
ISOPROTERENOLisoproterenol n. (Pharmacology) Synonym of isoprenaline.
ISOPROTERENOL n. a sympathomimetic agent used in the treatment of asthma.
MICROPOROSITYmicroporosity n. The state of being microporous.
MICROPOROSITY n. the property of micropores, very small pores.
MISPROPORTIONmisproportion v. (Transitive) To give the wrong proportions to.
MISPROPORTION v. to proportion wrongly.
MORPHOTROPIESMORPHOTROPY n. the effect on crystalline form of the addition or substitution of an element or radical.
OPPROBRIOUSLYopprobriously adv. In an opprobrious manner.
OPPROBRIOUS adv. expressing contemptuous reproach; bringing disgrace.
ORNITHOMORPHSornithomorphs n. Plural of ornithomorph.
ORNITHOMORPH n. a figure or design in the form of a bird.
ORTHOPTEROIDSorthopteroids n. Plural of orthopteroid.
ORTHOPTEROID n. a member of the Orthoptera, cockroaches.
ORTHOTROPISMSORTHOTROPISM n. vertical growth.
POLTROONERIESpoltrooneries n. Plural of poltroonery.
POLTROONERY n. mean pusillanimity, cowardice.
PROPORTIONALSproportionals n. Plural of proportional.
PROPORTIONAL n. a number or quantity in a proportion.
PROTOHISTORICprotohistoric adj. Of or pertaining to protohistory.
PROTOHISTORIC adj. relating to protohistory.
PROTONOTARIESprotonotaries n. Plural of protonotary.
PROTONOTARY n. a court clerk; a chief clerk of any of various courts of law, also PROTHONOTARY.
PROTOTROPHIESprototrophies n. Plural of prototrophy.
PROTOTROPHY n. the state of being prototrophic.
RHIZOMORPHOUSrhizomorphous adj. Of or relating to rhizomorphs.
RHIZOMORPHOUS adj. having the form of a root.
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 WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 97 words
  • Scrabble in French: 24 words
  • Scrabble in Spanish: 51 words
  • Scrabble in Italian: 84 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 121 words


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