The difference between Headmaster and Headteacher
When used as nouns, headmaster means a male school principal, whereas headteacher means the most senior teacher in a school who is responsible for its management and administration.
check bellow for the other definitions of Headmaster and Headteacher
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Headmaster as a noun (chiefly, UK):
A male school principal.
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Headteacher as a noun:
The most senior teacher in a school who is responsible for its management and administration.
Examples:
"I had to go and see the headteacher about my attitude."