Leg, Sufficient
そく
あし, た
None
The radical for foot and the kanji for foot are exactly the same.
That being said, there's also another meaning you should keep in mind, which is sufficient. If you think about it, one foot should be sufficient enough to walk around with if you hop.
What do you wear on your foot? You wear a sock (そく).
Currently there are no similar looking kanji which exist in the WaniKani learning system