This is the 1416th most frequent Korean word.
의사는
"의사는" means "doctor" in English.
Here, '의사는' ('the doctor' in English) is used as the subject of the sentence to indicate the profession of the individual performing the action of treating.
의사는 환자를 치료합니다.
The doctor treats the patient.
In this sentence, '의사는' again acts as the subject, contextualizing the person 'the doctor' who is engaging in the action of going to the hospital.
의사는 오늘 병원에 가요.
The doctor goes to the hospital today.
Here, '의사는' represents a general group of people belonging to the profession of doctors, serving as the subject that possesses the diversity of specialties.