The most common Korean word for “work” is 일 (il). There is one more word with a similar meaning — compare them below. 「work」는 한국어로 일.
work; task
TOPIK 1 · noun
to work
TOPIK 1 · verb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato