superminister

noun

su·​per·​min·​is·​ter ˌsü-pər-ˈmi-nə-stər 

variants or super-minister

plural superministers or super-ministers

: a government minister who has authority over other ministers or departments

… indicated that he has overall coordinating responsibilities as a sort of superminister for economic affairs.

—Richard Holbrooke

[Narenda] Modi [prime minister of India] said he would appoint super-ministers to make ministries coordinate better.

—Reuters

Word History

First Known Use

1854, in the meaning defined above