A person who takes part in something

A person engaged in a research study or trial

शोधार्थी

English Usage: As a participant in the clinical trial, he received a new medication.

Hindi Usage: क्लिनिकल ट्रायल में एक भागीदार के रूप में, उसे एक नई दवा मिली।

To take part in an activity or event (though used less frequently, often considered incorrect)

भाग लेना

English Usage: The students are participant in the debate competition.

Hindi Usage: छात्र वाद विवाद प्रतियोगिता में भाग ले रहे हैं।