The word 专用 is formed by combining two independent characters: 专 (zhuān), which carries the core meaning of "specialized", "exclusive", or "focused on one thing", and 用 (yòng), which means "to use" or "for the purpose of". Their conjunction creates a direct, conceptual compound where the meaning of the first character modifies and specifies the second, yielding the combined sense of "for a special or exclusive use" or "dedicated purpose", effectively conveying the idea of something reserved for a specific function or user.