The word 谋杀案 is formed through a logical, layered combination of concepts. It begins with 谋, which conveys the idea of a plot or premeditated scheme. This is directly coupled with 杀, meaning to kill, forming the core compound 谋杀 (murder), which specifies an intentional killing. Finally, 案, meaning a case or file, is appended, framing the entire preceding concept as a formal incident or matter for investigation, thus resulting in the complete meaning of "a murder case".