A bamboo thing you put on your head to stand taller would probably be a hat. A bamboo hat is probably one of those hats you think of when you think of rice farmers, a conical hat.
A conical hat is kind of like an umbrella on your head. What's the reading for "umbrella" in Japanese? Why, it's kasa (かさ)!
Currently there are no similar looking kanji which exist in the WaniKani learning system