This is the 4214th most frequent Russian word.
учитель
Teacher.
Here, 'учитель' refers to a person performing their role as an educator.
Учитель объясняет новую тему на доске.
The teacher explains the new topic on the board.
In this sentence, 'учитель' specifies a teacher specializing in mathematics.
Математический учитель был очень добрым и терпеливым.
The mathematics teacher was very kind and patient.
The term 'учитель' is used to indicate the individual's role as a teacher in an interaction.