A feather is on a rice paddy, and they are attached together. You put a feather on a rice paddy to create a giant airplane. Flawed, sure. But, this rice paddy + feather is going to be one wing of your amazing aircraft.
To make the feather and rice paddy stick together you need some kind of sticking agent. This time we find the original bird that the feather came from and grab its eggs. We break the eggs open and use the yolk (よく). It's pretty sticky, but still probably not aircraft safe.
Currently there are no similar looking kanji which exist in the WaniKani learning system