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There are 14 twelve-letter words containing OPERAT

COOPERATIONScooperations n. Plural of cooperation.
coöperations n. Plural of coöperation.
COOPERATION n. the action of cooperating.
COOPERATIVEScooperatives n. Plural of cooperative.
co-operatives n. Plural of co-operative.
COOPERATIVE n. an enterprise or organization owned by and operated for the benefit of those using its services.
DISOPERATIONDISOPERATION n. a mutually harmful relationship between two organisms in a community.
INTEROPERATEinteroperate v. (Intransitive, computing) To work reliably with another system.
NONOPERATINGnonoperating adj. Not operating.
nonoperating adj. Not of or pertaining to operation.
non-operating adj. Alternative form of nonoperating.
NONOPERATIVEnonoperative adj. Not requiring or involving a medical operation or surgery.
nonoperative adj. Not operative, not operational; inoperative.
nonoperative n. (Uncommon) One who is not an operative (“employee or worker”).
OPERATICALLYoperatically adv. In an operatic manner.
OPERATIC adv. relating to opera.
OPERATIONISMoperationism n. (Philosophy) The doctrine that the meaning of a term consists of the operation(s) performed in defining it.
OPERATIONISM n. the theory that defines scientific concepts by means of the operations used to prove or determine them, also OPERATIONALISM.
OPERATIONISToperationist n. A proponent of operationism.
OPERATIONIST n. an adherent of operationism.
OPERATORLESSoperatorless adj. Without an operator (person who operates); fully automatic.
OPERATORLESS adj. without an operator.
OVEROPERATEDoveroperated v. Simple past tense and past participle of overoperate.
OVEROPERATE v. to operate to excess.
OVEROPERATESoveroperates v. Third-person singular simple present indicative form of overoperate.
OVEROPERATE v. to operate to excess.
PREOPERATIVEpreoperative adj. Prior to surgery.
preoperative n. A transgender person who has not yet undergone gender reassignment surgery.
PREOPERATIVE adj. occurring before a surgical operation.
REOPERATIONSreoperations n. Plural of reoperation.
REOPERATION n. operation again.

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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