an iron pan, metal cap
鍪 centers on a metal cooking vessel or protective cover: an iron pan or a metal cap. Both meanings share the idea of a shaped metal object that holds or covers something.
鍪 combines 金 (metal) with 敄, which likely contributes the sound. The character is used for metal pans and caps, but the exact historical development of the top component is uncertain.
The bottom 金 is metal, and the top 敄 looks like a complex lid or handle. Picture a sturdy iron pan with an elaborate metal cap: 鍪 is that metal pan or cap.
For ボウ, imagine a metal bowl-shaped pan: bowl -> ボウ, and the pan is made of iron with a metal cap.