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List of 11-letter words containing

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There are 15 eleven-letter words containing E, N, 3O, P and T

COLEOPTERONCOLEOPTERON n. a large order of insects having the front wings modified as hard wing-cases, and comprising the beetles and weevils, also COLEOPTERAN.
COOPERATIONcooperation n. (Usually uncountable) The act of cooperating.
cooperation n. Active help from a person, organization, etc., such as an orderly sharing of space or resources.
cooperation n. Association for mutual benefit, such as for purposes of production or purchase.
IONOTROPIESIONOTROPY n. the reversible interconversion of a pair of organic isomers.
MONOSTROPHEmonostrophe n. A metrical composition having a single strophe.
MONOSTROPHE n. a poem in which all the stanzas or strophes are written in the same metre.
ODONTOPHOREodontophore n. A projection in the mouths of most molluscs, used with the radula to break up food.
ODONTOPHORE n. the rasping apparatus in molluscs.
ORTHOPNOEASorthopnoeas n. Plural of orthopnoea.
ORTHOPNOEA n. the ability to breathe in an upright position only.
ORTHOPTERONorthopteron n. Alternative form of orthopteran.
ORTHOPTERON n. any member of the Orthoptera, an order of mandibulate insects, also ORTHOPTERAN.
PHOTOIONISEPHOTOIONISE v. to ionize by electromagnetic radiation, also PHOTOIONIZE.
PHOTOIONIZEphotoionize v. (Physics) To cause, or to undergo photoionization.
PHOTOIONIZE v. to ionize by electromagnetic radiation, also PHOTOIONISE.
PHOTONOVELSphotonovels n. Plural of photonovel.
PHOTONOVEL n. a novel in the form of a series of photographs with speech balloons.
PHOTOPHONESphotophones n. Plural of photophone.
PHOTOPHONE n. an apparatus for the production of sound by the action of rays of light.
PHOTOSENSORphotosensor n. A photodetector.
PHOTOSENSOR n. a detector that is sensitive to electromagnetic radiation.
POLTROONERYpoltroonery n. Cowardice; lack of spirit; pusillanimity.
POLTROONERY n. mean pusillanimity, cowardice.
POTAMOGETONpotamogeton n. (Botany) Any of the plants of the genus Potamogeton.
Potamogeton prop.n. A taxonomic genus within the family Potamogetonaceae – pondweeds.
POTAMOGETON n. a plant of the pondweed genus of water plants, with floating and submerged leaves.
POULTROONESPOULTROONE n. (Shakespeare) a poltroon, also POLTROON.

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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