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List of 12-letter words containing

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There are 15 twelve-letter words containing 2E, G, 2N and 2O

COGENERATIONcogeneration n. The production of heat and/or power from the waste energy of an industrial process.
cogeneration n. The simultaneous or serial production of heat and electricity from the same source.
cogeneration n. Joint generation; cocreation.
DECONGESTIONdecongestion n. The process of decongesting something.
DECONGESTION n. the process of relieving congestion.
ENDOGENOUSLYendogenously adv. In an endogenous manner.
ENDOGENOUS adv. produced or growing from within.
FOREGONENESSforegoneness n. The quality of being foregone.
FOREGONENESS n. the state of being foregone.
FORETOKENINGforetokening n. Indication in advance.
foretokening v. Present participle of foretoken.
FORETOKENING n. the act of foretokening.
LONGSHOREMENlongshoremen n. Plural of longshoreman.
LONGSHOREMAN n. a stevedore; a person who makes a living along the shore by fishing, etc., also ALONGSHOREMAN.
LONGSOMENESSlongsomeness n. The quality of being longsome; lengthiness.
LONGSOMENESS n. the state of being longsome, extended in length, tiresome.
NEUROSURGEONneurosurgeon n. A surgeon specializing in brain surgery.
NEUROSURGEON n. a surgeon specialising in neurosurgery.
NONCOVERAGESnoncoverages n. Plural of noncoverage.
NONCOVERAGE n. lack of coverage.
NONGEOMETRICnongeometric adj. Not geometric.
ODONTOGENIESODONTOGENY n. the origin and development of teeth.
ORGANOGENIESORGANOGENY n. the development of living organisms.
PREGNENOLONEpregnenolone n. (Biochemistry, steroids) A steroid prohormone involved in the steroidogenesis of progesterone, mineralocorticoids…
PREGNENOLONE n. a steroid ketone formed by the oxidation of steroids and yielding progesterone on dehydrogenation.
PROLEGOMENONprolegomenon n. (Usually in the plural) A prefatory discussion; a formal essay or critical discussion serving to introduce…
PROLEGOMENON n. prefatory remarks; specifically, a formal essay or critical discussion serving to introduce and interpret an extended work.
WONDERMONGERWONDERMONGER n. one who promises miracles.

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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