This is the 320th most frequent Japanese word.
教室
Classroom
Here, '教室' refers to the physical classroom space.
教室の中には生徒がたくさんいます。
There are many students inside the classroom.
In this sentence, '教室' represents a specific type of class or lesson.
私は日曜日にピアノ教室に通っています。
I attend piano classes on Sundays.
Here, '教室' is used to describe the physical classroom environment.