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There are 13 fifteen-letter words containing OPERA

COOPERATIONISTS• COOPERATIONIST n. one who believes in cooperation.
COOPERATIVENESS• cooperativeness n. The state of being cooperative.
• COOPERATIVE n. working together.
COOPERATIVITIES• cooperativities n. Plural of cooperativity.
• COOPERATIVITY n. the state of being cooperative.
INOPERABILITIES• INOPERABILITY n. the quality of being inoperable.
INOPERATIVENESS• inoperativeness n. The state or condition of being inoperative; nonfunction.
• INOPERATIVE n. not operative.
NONCOOPERATIONS• noncooperations n. Plural of noncooperation.
• NONCOOPERATION n. failure or refusal to cooperate.
NONCOOPERATIVESSorry, definition not available.
OPERATIONALISMS• operationalisms n. Plural of operationalism.
• OPERATIONALISM n. the theory that defines scientific concepts by means of the operations used to prove or determine them, also OPERATIONISM.
OPERATIONALISTS• operationalists n. Plural of operationalist.
• OPERATIONALIST n. an exponent of operationalism.
OPERATIVENESSES• operativenesses n. Plural of operativeness.
• OPERATIVENESS n. OPERATIVE, having the power of operating or acting.
POSTOPERATIVELY• postoperatively adv. In a postoperative context; after surgery.
• POSTOPERATIVE adv. following a surgical operation.
TRIFLUOPERAZINE• trifluoperazine n. An antipsychotic drug of the phenothiazine group.
• TRIFLUOPERAZINE n. a tranquilizer chiefly used to treat psychotic conditions and esp. schizophrenia.
UNCOOPERATIVELY• uncooperatively adv. In an uncooperative manner.
• UNCOOPERATIVE adv. not cooperative.

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 1Word.ws and WikWik.org.

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