supremo
/sʊˈpreməʊ/Definitions
1. noun
a person in a position of supreme authority, power, or influence, especially in a particular organization or country.
“The supremo of the company made the final decision to launch the new product line.”
2. adjective
considered to be the best, most skilled, or most authoritative in a particular field or activity.
“The renowned chef was hailed as the supremeo of modern cuisine.”