The word 工具 is formed through the conceptual combination of two meaningful characters: 工 (gōng), which represents "work" or "labor", and 具 (jù), which means "tool" or "implement". Together, they create a compound idea where 工 defines the domain or purpose (work-related), and 具 specifies the category of object (an implement). This formation is not arbitrary but follows a logical semantic pattern where the first element modifies or specifies the second, resulting in the precise meaning of "a tool for work" or simply "tool".