Ear, Ears
The ear radical and ear kanji are the same in looks as well as meaning.
Study those radicals hard to make sure you know your kanji as well!
じ
みみ
None
Put your hand to your ear and sing... "Mimimimimimiiiii!" (みみ) and listen to your tone with your ear.
This is sort of a stereotypical singer sort of image. Make sure you concentrate a lot when you're listening to your mimimimiiii tone. In fact, why don't you do it out loud right now - make a little fool of yourself. It's fun, and it'll help you to remember!