Korean: 6 NHSK word(s): 操场* 5 cao1 chang3playground/ sports field/ drill ground/ CL:個|个[ge4] 操心* 5 cao1 xin1to worry about 操劳* 6 cao1 lao2to work hard/ to look after 操练* 6 cao1 lian4drill/ practice 操纵* 6 cao1 zong4to operate/ to control/ to rig/ to manipulate 操作* 6 cao1 zuo4to work/ to operate/ to manipulate KOREAN6000 word(s): KOREAN 2500 New HSK words): KOREAN Sentence(s):