The word 核弹 (hédàn) is formed through a direct and logical combination of its two component characters: 核 (hé), meaning "nuclear" or "core", and 弹 (dàn), meaning "bomb" or "projectile". It is created by placing the modifier 核 before the general category 弹, resulting in a precise, compound noun that specifies the type of bomb, a nuclear bomb. This formation mirrors the conceptual assembly of the object itself, where the defining characteristic (nuclear) is attached to the base object (bomb) to create a new, specific concept.