pinyin:xiāng & xiàng,

Chinese phrase: 相信 xiāng xìn - to believe
照相 zhào xiàng - take pictures

Examples:
箱
pinyin: xiāng
Chinese phrase: 箱子 xiāng zǐ - trunk, box; a square container for storing sth.
信箱 xìn xiāng - mailbox

想
pinyin: xiǎng, meaning: think, want
Chinese phrase: 想家 xiǎng jiā - homesick
想法 xiǎng fǎ - idea