How do you say sphere in Korean?
— 구체 (guche); 구 (기하)

Specialized synonyms for sphere in Korean
ball공 (gong), 구 (球, 'gu')
kingdom왕국 (wangguk)
land땅 (ttang); 뭍 (mut); 토지 (toji)
pearl진주 (jinju)