省 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
かえり.みる kaeri.miru はぶ.く habu.ku
KUNYOMI 訓読み
セイ sei ショウ shou
Examples
その省は内政問題の行政をつかさどる。The ministry administers the internal affairs.2002年:国土安全保障省設立法にブッシュ大統領がサインし正式な省となる。2002: President Bush signs the Homeland Security Act and it becomes an official Cabinet agency.