* Headmaster/Headmistress: These terms are typically used in traditional British schools, referring to the overall leader of the school.
* Principal: This is the most common term in the United States and many other countries, referring to the person in charge of the overall operation of the school.
* Director: This term can be used in some schools, particularly private or independent ones, and may have a more administrative focus compared to a Principal.
* Superintendent: This term is used for the person in charge of a group of schools within a district.
The best spelling will depend on the specific context and the school system you are referring to.