This is the 5608th most frequent Korean word.
민주
"민주" means "democracy."
In this sentence, '민주' is being used as a proper noun, which is a person's name.
민주는 학교에서 학생회 활동을 하고 있어요.
Minju is participating in student council activities at school.
Here, '민주' functions as part of the noun '민주주의', which means 'democracy', representing the concept of democratic governance.
한국은 민주주의를 중요하게 여기는 나라입니다.
Korea values democracy highly.
In this sentence, '민주적인' is an adjective meaning 'democratic', describing the type of environment referred to.