paper
「紙」 has another reading with different meanings.
newspaper
紙に名前と住所を書いてね。
Write your name and address on the paper.
古い紙をまとめてリサイクルに出した。
I gathered the old paper and put it out for recycling.
この紙は薄くて破れやすいから気をつけて。
This paper is thin and tears easily so be careful.