The word 叛军 (pànjūn, meaning "rebel army" or "insurgent force") is formed through a straightforward modifier-head (or determinative) compound structure common in Chinese. It combines the morpheme 叛 (pàn), which means "to betray" or "to rebel", with the morpheme 军 (jūn), meaning "army" or "military". In this construction, 叛 acts as a descriptive modifier specifying the type or nature of the 军, effectively creating the meaning "an army characterized by rebellion" or "a military force in a state of betrayal". This logical and semantic relationship makes the compound's meaning immediately clear to a literate reader.