Select the most appropriate 'one word' for the expression given below.

Exclusive command or possession

Monopoly

The most appropriate one-word substitute for the expression "exclusive command or possession" is monopoly.

• Sanctum means a holy or sacred place.
• Hypergamy means the practice of marrying someone of a higher social or economic status.
• Parvenu means someone who has recently come into wealth or social prominence.

Monopoly means exclusive control of a market or commodity. It is the most appropriate word for the given expression because it specifically refers to the exclusive possession of something.