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