Supremo (noun)

1. A leader or chief of a group or organization.
2. A person who holds the highest position of power or authority.

Origin:

From the spanish word "supremo" meaning supreme.

Examples:

1. The general was the supremo of the army.
2. The CEO was the supremo of the company.
3. The president was the supremo of the country.
4. The leader of the gang was the supremo.
5. The chairman of the board was the supremo of the organization.