When we call one's back, we call " 등허리" For example 1. Apply a pain relief patch to a sore spot on one's back. ---> '등허리'의 아픈 곳에 파스를 붙이다. We can also say "등" For example 1. Please pat my back -----> "등" 좀 두둘겨 주세요. We can aslo say "뒤태" For example 1. You have a beautiful back----> 당신은 아름다운 "뒤태"를 가지셨군요. 차 뒤쯕에 -----> 차 뒤쪽에가 맞습니다. We can't use " 등, 뒤태 " when we mention about the object such like car If you wanted to say what is one's back in Korean, it would "등" or "등허리"

Simply adding, 1) 뒤 is possible. '너 뒤에 뭐 묻었다' --- 'You got something on your back'. 2) 허리 is rather smaller part than human back. It's from the top of the buttocks to somewhere near the mid-lower part of the rib cage. 허리=waist. But, usually when someone says '허리 아파요', the pain usually refers to backpain, the lower part of the back. 3) 등 is commonly used to refer to 'back'. '등 좀 긁어줘.' ---'Scratch my back, please.' 4) I don't understand.. 차 뒤쪽에 means the back side of the car..

yes, korean ask me. 어떤걸 원하세요? you want?