a person who has acquired a specific skill or knowledge in a particular area

विशेषज्ञ

English Usage: She is a master at chess, winning many tournaments.

Hindi Usage: वह चेस में 전문가 है, जिसने कई टूर्नामेंट जीते हैं।

an individual with control or authority over others

dominant or principal

प्रमुख

English Usage: The master plan involves several key strategies.

Hindi Usage: मुख्य योजना में कई प्रमुख रणनीतियाँ शामिल हैं।

to become highly skilled or proficient in something

विशेषज्ञ होना

English Usage: He worked hard to master the instrument.

Hindi Usage: उसने वाद्य यंत्र में विशेषज्ञता प्राप्त करने के लिए कड़ी मेहनत की।