This is the 433rd most frequent Korean word.
안전
Safety.
Here, '안전' modifies '운전' (drive) to mean 'safe driving'.
안전운전 하세요.
Drive safely.
In this sentence, '안전' acts as the subject, emphasizing the importance of safety.
안전이 최우선입니다.
Safety is the top priority.
Here, '안전' refers to a general state or condition of being safe, linked with attentiveness.