CRS is an abbreviation that stands for multiple phrases like "central reservation system," "clinical research study," "complementary and alternative medicine regulatory system," and "common reporting standard." Interestingly, it has several synonyms too, depending on the context of usage. For instance, when it comes to "central reservation system," synonyms like "online booking system," "booking engine," "reservation management system," and "property management system" can be used. Similarly, if "clinical research study" is the CRS being referred to, then "clinical trial," "research investigation," and "clinical analysis" are some possible synonyms. In addition, when talking about "common reporting standard," synonyms like "common fiscal framework" and "international exchange of financial information" can be used interchangeably.