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There are 19 twelve-letter words containing 3E, L, N and 2O

CHLOROETHENEchloroethene n. (Organic chemistry) vinyl chloride, or any other chlorinated derivative of ethene.
CHLOROETHENE n. ethyl chloride.
COELENTERONScoelenterons n. Plural of coelenteron.
COELENTERON n. a coelenterate's saclike body cavity.
ELECTROPHONEelectrophone n. (Music) any instrument designed to create sounds using electric currents.
ELECTROPHONE n. any instrument whose sound is produced by the oscillation of an electric current, such as an electronic organ, synthesizer, etc.
ELECTROSONDEELECTROSONDE n. a sonde for measuring atmospheric electricity.
EMMENOLOGIESEMMENOLOGY n. the study of menstruation.
ENDOSKELETONendoskeleton n. (Anatomy) The internal skeleton of an animal, which in vertebrates is composed of bone and cartilage.
ENDOSKELETON n. an internal skeleton or supporting framework in an animal.
ENTEROCOELESenterocoeles n. Plural of enterocoele.
ENTEROCOELE n. a coelom originating by outgrowth from the archenteron, also ENTEROCOEL.
ENTEROCOELICenterocoelic adj. Relating to an enterocoel or to enterocoely.
ENTEROCOELIC adj. of or like an enterocoele.
ETONOGESTRELetonogestrel n. A steroidal progestin used in hormonal contraceptives.
ETONOGESTREL n. a molecule used in certain hormonal contraceptives.
EXOSKELETONSexoskeletons n. Plural of exoskeleton.
EXOSKELETON n. an external skeleton.
GENECOLOGIESgenecologies n. Plural of genecology.
GENECOLOGY n. the study of the gene frequency of a species in relation to its population distribution within a particular environment.
LONESOMENESSlonesomeness n. The state of being lonesome.
LONESOMENESS n. the state of being lonesome.
MONOTHELETESMonotheletes n. Plural of Monothelete.
MONOTHELETE n. a believer in Monotheletism.
NONEMPLOYEESnonemployees n. Plural of nonemployee.
NONEMPLOYEE n. one who is not an employee.
OBSOLESCENCEobsolescence n. (Uncountable) The state of being obsolete—no longer in use; gone into disuse; disused or neglected.
obsolescence n. (Countable) The process of becoming obsolete, outmoded or out of date.
OBSOLESCENCE n. the process of becoming obsolete or the condition of being nearly obsolete.
OBSOLETENESSobsoleteness n. The quality or state of being obsolete or no longer in use.
obsoleteness n. (Biology) The quality of being imperfectly or indistinctly developed.
OBSOLETENESS n. the state of being obsolete.
OVERENROLLEDoverenrolled adj. For which too many people have enrolled.
OVERENROLLED adj. with too many enrolments.
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.
SELENOLOGIESselenologies n. Plural of selenology.
SELENOLOGY n. the study of the moon.

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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