oriole
鶬 refers specifically to the oriole, a type of bird. The meaning is narrow and does not extend to broader concepts.
鶬 combines 倉 (warehouse/granary) with 鳥 (bird). The exact historical reason for this combination is uncertain; it may be a phono-semantic compound where 倉 provides the sound and 鳥 indicates a bird.
Imagine a warehouse (倉) full of colorful orioles (鳥) singing. The bird on the right reminds you it's a bird, and the warehouse on the left helps you recall the specific oriole meaning.
For ソウ, picture an oriole singing a soulful song inside the warehouse: soul -> ソウ, and the bird's melody fills the granary.