pinyin: guǒ

Chinese phrase: 水果 shuǐ guǒ - fruit
结果 jié guǒ - result

Examples:
裹
pinyin: guǒ; meaning: to wrap, wind.
Chinese phrase: 包裹 bāo guǒ
- a parcel
裹伤口 guǒ shāng kǒu - bind up the wound

棵
pinyin: gū; a measure word for plants
Chinese phrase: 一棵树 yī kē shù - a tree

颗
pinyin: gū; a measure word for round articles or granules
Chinese phrase: 一颗心 yī kē xīn - a heart
一颗珍珠 yī kē zhēn zhū - a pearl