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List of 13-letter words containing

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There are 19 thirteen-letter words containing I, N, 2O, 2P and 2S

COSPONSORSHIPcosponsorship n. Joint sponsorship by more than one party.
COSPONSORSHIP n. the state of being a cosponsor.
DEIPNOSOPHISTdeipnosophist n. A master of the art of dining, particularly learned conversation in the manner of Athenaeus’s characters.
DEIPNOSOPHIST n. a person skilled in dinner conversation.
DOORSTEPPINGSdoorsteppings n. Plural of doorstepping.
DOORSTEPPING n. going from door to door canvassing.
NEPHROSCOPIESnephroscopies n. Plural of nephroscopy.
NEPHROSCOPY n. use of the nephroscope.
OPPOSITIONISToppositionist n. A person who opposes; especially a member of an official opposition.
OPPOSITIONIST n. a member of an opposition.
PERISPOMENONSPERISPOMENON n. a word having a circumflex accent on the final syllable.
PHOSPHOKINASEphosphokinase n. (Biochemistry) kinase.
PHOSPHOKINASE n. a kind of enzyme, aka kinase.
PHOSPHORISINGphosphorising v. Present participle of phosphorise.
PHOSPHORISE v. to combine or impregnate with phosphorus, also PHOSPHORIZE.
POLYISOPRENESpolyisoprenes n. Plural of polyisoprene.
POLYISOPRENE n. a rubberlike polymer of isoprene.
PORPHYROPSINSporphyropsins n. Plural of porphyropsin.
PORPHYROPSIN n. a purple pigment in the retinal rods of freshwater fishes that resembles rhodopsin.
POSTPOSITIONSpostpositions n. Plural of postposition.
POSTPOSITION n. the placing of a grammatical element after a word to which it is primarily related in a sentence.
PRAXINOSCOPESpraxinoscopes n. Plural of praxinoscope.
PRAXINOSCOPE n. an instrument with mirrors in which a series of moving drawings appear as a continuously moving picture; an early form of cinematograph.
PREPOSSESSIONprepossession n. Preoccupation; having possession beforehand.
prepossession n. A preconceived opinion, or previous impression; bias, prejudice.
PREPOSSESSION n. a fixed conception likely to preclude objective judgment of anything seeming to be counter to it.
PROCONSULSHIPproconsulship n. The office or status of a proconsul; a proconsulate.
PROCONSULSHIP n. the office of proconsul.
PROSCRIPTIONSproscriptions n. Plural of proscription.
PROSCRIPTION n. the act of proscribing.
PROSOPAGNOSIAprosopagnosia n. (Neurology, pathology, psychology) A form of visual agnosia characterized by difficulty with face recognition…
PROSOPAGNOSIA n. inability to recognize familiar faces.
SIPHONOPHORESsiphonophores n. Plural of siphonophore.
SIPHONOPHORE n. a marine creature, colonial in habit.
SUPERPOSITIONsuperposition n. The placing of one thing on top of another.
superposition n. (Geology) The deposition of one stratum over another; the principle that in a series of sedimentary…
superposition n. (Quantum mechanics) The situation in quantum mechanics where two or more quantum states are added together…
SUPPOSITIONALsuppositional adj. Relating to, or based on, supposition; hypothetical; conjectural.
SUPPOSITIONAL adj. having the nature of a 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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See this list for:

  • English Wiktionary: 81 words
  • Scrabble in French: 41 words
  • Scrabble in Spanish: 11 words
  • Scrabble in Italian: 41 words
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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