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There are 15 twelve-letter words containing N, 3O, P, R and 2S

CHRONOSCOPESchronoscopes n. Plural of chronoscope.
CHRONOSCOPE n. an instrument for measuring very short time intervals.
COSPONSORINGcosponsoring v. Present participle of cosponsor.
co-sponsoring v. Present participle of co-sponsor.
COSPONSOR v. to sponsor jointly.
IONOPHORESESIONOPHORESIS n. the migration of charged particles, e.g. of a drug, into body tissue.
IONOPHORESISionophoresis n. The movement of charged particles in an electric field.
ionophoresis n. Misspelling of iontophoresis.
IONOPHORESIS n. the migration of charged particles, e.g. of a drug, into body tissue.
LYOSORPTIONSLYOSORPTION n. the adsorption of a liquid on a solid surface, esp. of a solvent on suspended particles.
MONOPOLISERSmonopolisers n. Plural of monopoliser.
MONOPOLISER n. one who monopolises, also MONOPOLIZER.
MONOPTEROSESMONOPTEROS n. a building with single ring of columns supporting a roof.
MONOSPERMOUSmonospermous adj. (Botany) Having only one seed.
MONOSPERMOUS adj. producing only one seed, also MONOSPERMAL.
MONOSTROPHESmonostrophes n. Plural of monostrophe.
MONOSTROPHE n. a poem in which all the stanzas or strophes are written in the same metre.
NONCOMPOSERSnoncomposers n. Plural of noncomposer.
NONCOMPOSER n. one who is not a composer.
OZONOSPHERESozonospheres n. Plural of ozonosphere.
OZONOSPHERE n. the ozone layer.
PHOTOSENSORSphotosensors n. Plural of photosensor.
PHOTOSENSOR n. a detector that is sensitive to electromagnetic radiation.
PROPOSITIONSpropositions n. Plural of proposition.
propositions v. Third-person singular simple present indicative form of proposition.
PROPOSITION v. to make a proposal to.
SNOOPERSCOPEsnooperscope n. Synonym of sniperscope.
SNOOPERSCOPE n. an instrument for viewing infrared radiation.
TROPOMYOSINStropomyosins n. Plural of tropomyosin.
TROPOMYOSIN n. a filamentous protein which controls the interaction of actin and myosin in muscle fibres.

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: 66 words
  • Scrabble in French: 18 words
  • Scrabble in Spanish: 13 words
  • Scrabble in Italian: 39 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 4 words


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