snail
蝸 centers on the snail, a small creature with a spiral shell. The meaning is specific and concrete, with no major abstract extensions.
蝸 combines 虫 (insect/creature) with 咼, which likely contributes the sound. The character was created to represent a snail, a small creature with a shell.
The left side 虫 is the insect/creature radical, and the right side 咼 looks like a spiral shell with a mouth-like opening. Picture a snail with its shell on the right and its soft body on the left.
For カ, imagine a snail slowly crawling across a car: car -> カ, and the snail leaves a slimy trail on the vehicle.
snail
Euhadra peliomphala (species of land snail)
vestibulocochlear nerve
little house; my humble home
snail
cochlea
cochlear nerve
cochlear duct
trifling (fight); (a conflict) between small countries
fighting over nothing; making a mountain out of a molehill
eyestalk (on a snail)
fighting over nothing; making a mountain out of a molehill