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There are 17 twelve-letter words containing N, 3O, P, 2S and T

COMPOSITIONScompositions n. Plural of composition.
COMPOSITION n. a piece of writing.
LYOSORPTIONSLYOSORPTION n. the adsorption of a liquid on a solid surface, esp. of a solvent on suspended particles.
MONOPSONISTSmonopsonists n. Plural of monopsonist.
MONOPSONIST n. a participant in a monopsony.
MONOPTEROSESMONOPTEROS n. a building with single ring of columns supporting a roof.
MONOSTROPHESmonostrophes n. Plural of monostrophe.
MONOSTROPHE n. a poem in which all the stanzas or strophes are written in the same metre.
OPISTHOTONOSopisthotonos n. (Medicine) Sustained tetanic spasm in which the body is bent backwards and stiffened, as produced by various diseases.
OPISTHOTONOS n. extreme arching backwards of the spine and neck as a result of spasm of the muscles in that region, etc.
OPSONISATIONopsonisation n. (British spelling, immunology) Alternative spelling of opsonization.
OPSONISATION n. the process of opsonising, also OPSONIZATION.
OVIPOSITIONSovipositions n. Plural of oviposition.
OVIPOSITION n. the act of ovipositing.
PHONOLOGISTSphonologists n. Plural of phonologist.
PHONOLOGIST n. a student of phonology, the branch of linguistics that deals with systems of sounds.
PHOTOFISSIONphotofission n. (Nuclear physics) Nuclear fission as the result of the absorption of a gamma ray or other high-energy photon.
photofission v. (Nuclear physics) To undergo, or cause to undergo, photofission.
PHOTOFISSION n. nuclear fission induced by gamma rays.
PHOTOIONISESPHOTOIONISE v. to ionize by electromagnetic radiation, also PHOTOIONIZE.
PHOTOSENSORSphotosensors n. Plural of photosensor.
PHOTOSENSOR n. a detector that is sensitive to electromagnetic radiation.
PHOTOTONUSESPHOTOTONUS n. the sensitivity of a living organism to light.
POSTPOSITIONpostposition n. (Grammar) A word that has the same purpose as a preposition but comes after the noun.
postposition n. The act of placing after, or the state of being placed after.
POSTPOSITION n. the placing of a grammatical element after a word to which it is primarily related in a sentence.
PROPOSITIONSpropositions n. Plural of proposition.
propositions v. Third-person singular simple present indicative form of proposition.
PROPOSITION v. to make a proposal to.
SPONGOLOGISTspongologist n. One who studies spongology.
SPONGOLOGIST n. one who studies sponges.
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 1Word.ws and WikWik.org.

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See this list for:

  • English Wiktionary: 65 words
  • Scrabble in French: 20 words
  • Scrabble in Spanish: 7 words
  • Scrabble in Italian: 20 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 4 words


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