課

Phono-semantic compound:

言 - radical signifies speech, instruction, or communication, suggesting the idea of teaching or assigning;

果 - component provides the pronunciation 과 and conceptually implies results or outcomes;

It connecting to the idea of lessons or assignments that yield results.

課 usually refers to lessons, courses, or assigned tasks.

The native Korean gloss ‘공부할 과’ means “to study” or “to take a lesson,” while ‘과정 과’ refers to the content of a course.

科 originally referred to a “division, category, or subject” (as in 과목).

課 refers more to instructional lessons, coursework, or assignments (as in 課程 curriculum).

In practice, 課 is the usual choice when referring to a lesson or course being taught.