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There are 12 eight-letter words beginning with OPER

OPERABLE• operable adj. Able to be operated or used.
• operable adj. Able to be put into operation; practicable.
• operable adj. Able to be treated by surgery.
OPERABLY• operably adv. (Medicine) Such that it allows an operation to take place.
• OPERABLE adv. that can be operated.
OPERANDS• operands n. Plural of operand.
• OPERAND n. a quantity on which a mathematical or logical operation is (to be) performed.
OPERANTS• operants n. Plural of operant.
• OPERANT n. an operator.
OPERATED• operated v. Simple past tense and past participle of operate.
• operated adj. (In combination) operated by the means specified e.g. a battery-operated toy.
• operated adj. Having undergone an operation.
OPERATES• operates v. Third-person singular simple present indicative form of operate.
• OPERATE v. to perform a function.
OPERATIC• operatic adj. Of, related to, or typical of opera.
• OPERATIC adj. relating to opera.
OPERATOR• operator n. One who operates.
• operator n. A telecommunications facilitator whose job is to establish temporary network connections.
• operator n. (Mathematics) A function or other mapping that carries variables defined on a domain into another variable…
OPERCELE• OPERCELE n. an anatomical part that serves as a lid or cover, also OPERCULE, OPERCULUM.
OPERCULA• opercula n. Plural of operculum.
• OPERCULUM n. (Latin) an anatomical part that serves as a lid or cover, also OPERCELE, OPERCULE.
OPERCULE• opercule n. Alternative form of operculum.
• OPERCULE n. an anatomical part that serves as a lid or cover, also OPERCELE, OPERCULUM.
OPERETTA• operetta n. (Music) A lighter version of opera with a frivolous story and spoken dialogue.
• OPERETTA n. (Italian) a light musical drama with dialogue.

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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