boots
鞾 centers on footwear made of leather: boots. It is a specific character for boots, distinct from general shoes.
鞾 combines 革 (leather) with 華, which likely contributes the sound. The character specifically denotes leather boots.
The left side 革 means leather, and the right side 華 suggests something ornate or elaborate. Picture a pair of fancy leather boots with decorative stitching.
For カ, imagine a pair of leather boots that go 'ka-clunk' with each step: ka -> カ, and the sound echoes as you walk in your boots.