급
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急 (Urgent, fast)
- 급하다 <急-> - To be urgent
 - 긴급(하다) <緊急> - To be urgent
 - 급행(열차) <急行> - An express (train)
 - 응급실 <應急室> - Emergency room
 - 급등(하다) <急騰> - Rise suddenly (cost, price
 
級 (Class, grade)
- 고급 <高級> - Advanced level
 - 중급 <中級> - Intermediate level
 - 초급 <初級> - Elementary level
 - 등급 <等級> - A grade, rank