cognoscente /ko-nyō-shenˈtā/

1. A person professing an expert knowledge, esp of works of art, music, literature, etc
2. A connoisseur

• operating room
• operating rooms
• operating system
• operating systems
• operating table
• operating tables
• operating theatre
• operating theatres
• operation
• operational
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• operationalism
• operationalist
• operationalists
• operationally
• operational research
• operationism
• operationist
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• operations
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• operative
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• operativeness