The difference between Head of government and Prime minister
When used as nouns, head of government means the chief officer of the executive branch of a government, often presiding over a cabinet, whereas prime minister means in a parliamentary democracy, the chief member of the cabinet and head of the government.
check bellow for the other definitions of Head of government and Prime minister
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Head of government as a noun:
The chief officer of the executive branch of a government, often presiding over a cabinet; usually called Prime Minister (in a parliamentary system) or President (in a presidential system).
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Prime minister as a noun:
In a parliamentary democracy, the chief member of the cabinet and head of the government; often the leader of the majority party.
Examples:
"This is a list of all prime ministers since Churchill."
"Yesterday we had a visit from the Prime Minister / prime minister.'' (See usage notes below.)"