紙 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
かみ kami
KUNYOMI 訓読み
シ shi
Examples
紙に線を1本引きなさい。Draw a line on the paper.紙がほしい。I need some paper.書く紙がない。There is no paper to write on.紙か何かある?Do you have some paper or something?紙はすぐに燃える。Paper burns easily.紙は木から作られる。Paper is made from wood.なんか紙ちょうだい。Can I borrow something to write on?彼女は本を紙で包んだ。She did the book up in paper.書く紙を一枚ください。Please give me a sheet of paper.どんな紙でも結構です。Any paper will do.