The Chinese word **过滤器** (guòlǜ qì), meaning "filter," is a compound noun formed through semantic combination: the verb phrase **过滤** (guòlǜ), meaning "to filter" or "to strain," is combined with the nominal suffix **器** (qì), which denotes a tool, device, or instrument. Therefore, the word literally and logically translates to "a device that filters," clearly and efficiently describing its function through the standard Chinese morphological process of creating tool names by attaching **器** to an action verb.