vessel
錩 centers on a metal container or vessel. The meaning is narrow and concrete, referring to a specific type of metalware.
錩 combines the metal radical 金 with 昌, which likely contributes the sound. The character is a phono-semantic compound referring to a metal vessel.
The left side 金 means metal, and the right side 昌 looks like a shining sun over a container. Picture a bright metal vessel gleaming in the sunlight.
For ショウ, imagine a show of shiny metal vessels on display: show -> ショウ, and the metal 金 vessel 錩 is the star of the show.