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There are 3 seven-letter words beginning with OPERA

OPERAND	• operand n. (Mathematics, computing) A quantity to which an operator is applied (in 3−𝑥, the operands of the subtraction… • OPERAND n. a quantity on which a mathematical or logical operation is (to be) performed.
OPERANT	• operant adj. That operates to produce an effect. • operant n. An operative person or thing. • operant n. (Psychology) Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
OPERATE	• operate v. (Transitive or intransitive) To perform a work or labour; to exert power or strength, physical or mechanical; to act. • operate v. (Transitive or intransitive) To produce an appropriate physical effect; to issue in the result designed… • operate v. (Transitive or intransitive) To act or produce effect on the mind; to exert moral power or influence.

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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English Wiktionary: 5 words
Scrabble in French: 3 words
Scrabble in Spanish: 7 words
Scrabble in Italian: 12 words
Scrabble in German: 1 word
Scrabble in Romanian: 10 words

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1word.ws to play with words, anagrams, suffixes, prefixes, etc.
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