학생 (hak-saeng) is the most common word for student.
학교 (hak-gyo) means school.
공부 (gong-bu) means study or studying.
학생 (hak-saeng) means "student" – a person who goes to school and studies.
1. Student: 학생 (hak-saeng) student
2. School: 학교 (hak-gyo) school
3. Study: 공부 (gong-bu) study
I am a student
I go to school
I'm studying
• 학교 (hak-gyo) school
• 공부 (gong-bu) study
• 대학생 (dae-hak-saeng) university student