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There are 19 fourteen-letter words containing OPER

COOPERATIONISTCOOPERATIONIST n. one who believes in cooperation.
DISPROPERTYINGdispropertying v. Present participle of disproperty.
DISPROPERTY v. (Shakespeare) to deprive of property.
HYDROPEROXIDEShydroperoxides n. Plural of hydroperoxide.
HYDROPEROXIDE n. a compound containing an O2H group.
IMPROPERNESSESIMPROPERNESS n. the state of being improper.
INOPERABLENESSINOPERABLE n. that cannot be operated upon.
INTEROPERATINGinteroperating v. Present participle of interoperate.
INTEROPERATIVEinteroperative adj. During a surgical operation.
INTEROPERATIVE adj. between operatives.
ISOPERIMETRIESISOPERIMETRY n. the state of being isoperimetrical.
NONCOOPERATIONnoncooperation n. The active absence of cooperation.
non-cooperation n. Alternative spelling of noncooperation.
NONCOOPERATION n. failure or refusal to cooperate.
NONCOOPERATIVEnoncooperative adj. Not cooperative; uncooperative.
NONCOOPERATIVE adj. of, relating to, or characterized by noncooperation.
NONCOOPERATORSnoncooperators n. Plural of noncooperator.
NONCOOPERATOR n. one who does not cooperate.
NONOPERATIONALnonoperational adj. Not operating; not working.
nonoperational adj. Not associated with operation. (Can we add an example for this sense?)
non-operational adj. Alternative form of nonoperational.
OPERATIONALISMoperationalism n. (Sciences) A philosophy that attempts to define all scientific concepts in terms of specified operations…
OPERATIONALISM n. the theory that defines scientific concepts by means of the operations used to prove or determine them, also OPERATIONISM.
OPERATIONALISToperationalist n. A proponent of operationalism.
OPERATIONALIST n. an exponent of operationalism.
PHOTOPERIODISMphotoperiodism n. (Biology) The growth, development and other responses of plants and animals according to the length…
PHOTOPERIODISM n. a plant or animal's response or capacity to respond to photoperiod.
PREOPERATIONALpreoperational adj. Prior to a surgical operation.
preoperational adj. In or relating to a Piagetian phase of child development characterized by sparse and logically inadequate…
PREOPERATIONAL adj. preceding an operation.
PREOPERATIVELYpreoperatively adv. In a preoperative context; before surgery.
PREOPERATIVE adv. occurring before a surgical operation.
PROPERISPOMENAproperispomena n. Plural of properispomenon.
PROPERISPOMENON n. a word with the circumflex accent on the penultimate syllable.
THERMOPERIODICthermoperiodic adj. Relating to a thermoperiod.
THERMOPERIODIC adj. relating to thermoperiodism, the effect on an organism of rhythmic temperature variations.

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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