"هٰذا الْحائِط كَبير."
Translation:This wall is big.
There are some differences between الجدار and الحائط. ... In short, الجدار is a building towered on the ground and doesn't have a certain shape (such as quadrilateral); as mentioned in Quran, while الحائط is a wall that have a certain shape (like as quadrilateral) - from the أحاط word mentioned in Quran, which means "surround".
But, we can simply say the "wall" for both.