schoolmaster
n.a male teacher in a school, especially one who is in charge of a class or a school. This word is much less common today and sounds a bit old-fashioned.
n.a male teacher or head of a school, particularly in a British or historical context. Often carries a slightly formal or archaic tone in modern usage.
“The schoolmaster stood at the front of the classroom.”
“In the nineteenth century, the schoolmaster was often the most respected figure in a small rural village.”
“The novel depicts the stern schoolmaster as a figure of both fear and quiet admiration, whose rigid discipline was seen as necessary for the moral development of the students.”
From Middle English skolemayster, scolemaister, scol-meister, equivalent to school + master.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.