The most common Korean word for “button” is 단추 (danchu). 「button」는 한국어로 단추.
Learn 단추 free — flashcards, audio and review →「단추」 단어장으로 무료로 외우기Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato