federal chancellor
Specifically refers to the head of government in a federal system, most commonly the German Bundeskanzler or Austrian Bundeskanzler. Not a generic term for prime minister.
The federal chancellor of Germany is Olaf Scholz.
The federal chancellor is elected by the federal parliament.
Compound of 連邦 (れんぽう, 'federation') and 首相 (しゅしょう, 'prime minister').