This is the 14835th most frequent Korean word.
박사
"Doctor" (an expert or holder of a doctoral degree).
The word '박사' is used here to indicate a person holding a Ph.D. degree in a specific field, namely biology.
그는 생물학 박사입니다.
He is a Doctor of Biology.
In this sentence, '박사' refers to the doctoral or Ph.D. level of academic work or research.
박사 논문 작성을 끝냈어요.
I have completed writing my doctoral thesis.
Here, '박사' is used to describe someone with expert knowledge or qualifications in the field of music.