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There are 18 twelve-letter words containing A, E, M, N, O, P, T and U

ACCOUPLEMENTaccouplement n. (Rare) The act of coupling, or the state of being coupled; union.
accouplement n. (Rare) That which couples, as a tie or brace.
ACCOUPLEMENT n. a timber joist or beam that serves as a tie or support.
DEPLUMATIONSDEPLUMATION n. the removal of feathers.
DESPUMATIONSdespumations n. Plural of despumation.
DESPUMATION n. the throwing off of impurities.
INCOMPUTABLEincomputable adj. Not computable; that cannot be computed, calculated or estimated.
INCOMPUTABLE adj. not computable.
MAGNETOPAUSEmagnetopause n. The boundary between the Earth’s magnetosphere and the sun’s plasma.
MAGNETOPAUSE n. the outer boundary of a magnetosphere.
MONOPETALOUSmonopetalous adj. (Botany) Having only one petal, or the corolla in one piece, or composed of petals cohering so as to…
MONOPETALOUS adj. having petals united.
OUTPLACEMENToutplacement n. The process of helping to find new employment for redundant workers, especially executives.
OUTPLACEMENT n. the process of easing unwanted or unneeded executives out of a company by providing company-paid assistance in finding them new jobs.
PERITONAEUMSPERITONAEUM n. a serous membrane enclosing the viscera in the abdominal and pelvic cavities, also PERITONEUM.
PERMUTATIONSpermutations n. Plural of permutation.
PERMUTATION n. the arrangement of a set of things in every possible order.
PNEUMATHODESPNEUMATHODE n. a band or pore or aerating tissue, esp. along the stipes of ferns.
PNEUMATOLOGYpneumatology n. The study of spiritual beings and phenomena, especially the interactions between humans and God.
pneumatology n. (Christianity, theology) The study of the Holy Spirit as revealed in Scripture.
pneumatology n. The science dealing with air or gases, their physical and chemical properties, therapeutic applications, etc.
PNEUMOTHORAXpneumothorax n. (Medicine) Presence of air inside the pleural cavity, usually caused by injury either to the lung or the chest wall.
PNEUMOTHORAX n. accumulation of air or gas in the pleural cavity.
PORTMANTEAUSportmanteaus n. Plural of portmanteau.
PORTMANTEAU n. (French) a case opening in two parts, used for carrying clothes while traveling, also PORTMANTLE, PORTMANTUA.
PORTMANTEAUXportmanteaux n. Plural of portmanteau.
PORTMANTEAU n. (French) a case opening in two parts, used for carrying clothes while traveling, also PORTMANTLE, PORTMANTUA.
REASSUMPTIONreassumption n. Assumption again or anew.
REASSUMPTION n. the act of reassuming.
TEMPORANEOUStemporaneous adj. (Obsolete) temporary.
TEMPORANEOUS adj. (obsolete) lasting only a short while.
UNCOMPLACENTuncomplacent adj. Not complacent.
UNCOMPLACENT adj. not complacent.
UNIMPORTANCEunimportance n. Lack of importance.
UNIMPORTANCE n. lack of importance.

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: 90 words
  • Scrabble in French: 42 words
  • Scrabble in Spanish: 71 words
  • Scrabble in Italian: 56 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 45 words


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