This is the 14647th most frequent Korean word.
미주
"미주" in Korean can mean "America," "North and South America," or refer to "the Americas."
In this sentence, '미주' is used as a term indicating a geographical region.
미주는 미국과 캐나다를 포함한 북미 지역을 뜻합니다.
Miju refers to the North America region including the United States and Canada.
Here, '미주' is used as a proper noun, presumably as a person's name.
미주의 친구가 선생님으로 일합니다.
Miju's friend works as a teacher.
In this context, '미주' is used again to refer to the geographical region representing North and South America.