It's the 2-word title for the head of a parliamentary government
federal government: The Government of... [DOC] [TLE] parliamentary democracy | government | Britannica.com [PAR] Parliamentary democracy, democratic form of government in which the party (or a 
... in the parliament (legislature) forms the government, its leader becoming prime 
minister ... in western Europe, the title of holders of numerous offices of varying... [DOC] [TLE] Prime minister | Define Prime minister at Dictionary.com [PAR] the principal minister and head of government in parliamentary systems; chief of 
the ... the head of a parliamentary government.