mast
檣 centers on the tall vertical pole that supports sails on a ship: a mast.
檣 combines 木 (tree, wood) with 嗇, which likely contributes the sound. The character specifically denotes a wooden mast on a ship.
The left side is 木 (tree, wood), and the right side 嗇 looks like a complex structure. Picture a tall wooden mast rising from a ship, with the right side suggesting the rigging and sails attached to it.
For ショウ, imagine a ship's mast casting a long shadow on the water: shadow -> ショウ, and the mast stands tall in the sunlight.