This is the 12381st most frequent Russian word.
кардиологии
The study of the heart and its diseases.
The word 'кардиологии' (cardiology) here is used in the context of an academic field of study.
Я изучаю кардиологию в медицинском университете.
I study cardiology at the medical university.
The word 'кардиологии' (cardiology) here is used to denote a hospital or clinical department.
Пациент был направлен на консультацию в отделение кардиологии.
The patient was referred to the cardiology department for consultation.
The word 'кардиологии' (cardiology) here refers to the general scientific area devoted to understanding heart-related conditions.