The Vietnamese word "gối" is a noun that primarily means "pillow" or "cushion." It can refer to various types of cushions, but it is most commonly associated with the pillow you sleep on.
You can use the word "gối" when talking about items you rest your head on while sleeping or any soft cushion used for comfort.
Tôi cần một cái gối mềm để ngủ.
Cô ấy dựa đầu vào gối khi xem phim.
In summary, "gối" is a versatile word primarily meaning "pillow" but can also refer to cushions and has different meanings in specific contexts.