The most common Korean word for “gather” is 모이다 (moida). There is one more word with a similar meaning — compare them below. 「gather」는 한국어로 모이다.
to gather; to assemble
TOPIK 2 · verb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato