The word "刀枪" is formed by combining the character "刀", meaning knife or blade, with the character "枪", meaning spear or gun, both of which are concrete nouns for weapons. This direct juxtaposition creates a compound noun where the individual meanings aggregate to represent a broader category of weapons, specifically encompassing bladed and piercing or projectile arms. The formation simply merges the two characters without morphological change, relying on their semantic relation to denote the general concept of weapons.