The Khmer Rouge was a brutal regime that ruled Cambodia from 1975 to 1979, during which millions of people were killed. While it is important to use the proper term when discussing this period of history, there are also synonyms that can be used in certain contexts to avoid repetition or to provide context. Some alternatives to the term "Khmer Rouge" include "Pol Pot regime," "Democratic Kampuchea," and "Criminal Communist Party of Kampuchea." It is worth noting that the use of these terms can be politically charged, and should be used with care and an understanding of their historical context. Overall, it is important to remember the atrocities committed during this time, and to use language that accurately reflects the gravity of the situation.