supply teacher

A substitute teacher is a person who teaches a school class when the regular teacher is absent or unavailable; e.g., because of illness, personal leave, maternal or paternal leave and so on. "Substitute teacher" is the most commonly used phrase in the United States, South Africa, Canada, India and Ireland, while supply teacher is the most commonly used term in Great Britain and the Canadian provinces of Ontario and New Brunswick. The term cover teacher is also used in Great Britain. Common synonyms for substitute teacher include relief teacher or casual relief teacher and "emergency teacher". Other terms, such as "guest teacher", are also used by some schools or districts. Regional variants in terminology are common, such as the use of the term teacher teaching on call (TTOC) in the Canadian province of British Columbia and occasional in Ontario.