This is the 64th most frequent Korean word.
일본
Japan.
Here, '일본' is used as a noun referring to the country Japan.
나는 일본에 여행을 갈 예정입니다.
I am planning to travel to Japan.
'일본' is used to indicate a location, specifically that something originated from Japan.
이번 신제품은 일본에서 제조되었습니다.
The new product was manufactured in Japan.
In this sentence, '일본' is used as part of the compound word '일본어', meaning the Japanese language.