/ˈpɪləʊ/
a square or rectangular piece of cloth filled with soft material, used to rest your head on in bed 枕头
She lay back against the pillows.
她半躺半坐靠在枕头上。
pillow talk (= conversations in bed between lovers)
枕边细语
He lay back on the grass using his backpack as a pillow.
他用背包当枕头仰卧在草地上。