The most common Korean word for “restaurant” is 식당 (sikdang). There are 2 more words with a similar meaning — compare them below. 「restaurant」는 한국어로 식당.
restaurant; cafeteria
TOPIK 1 · noun
restaurant
TOPIK 2 · noun
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato