Pleasure and happiness are like, shall I say brother and sister, or maybe cousins? I am just speaking metaphorically. Most of the time, it depends on the senses of smell, taste, sight, touch, and hearing. Pleasure is about emotional involvement. the emotions and the feelings are always active.
On the other hand, happiness is an inner sensation. Pleasure lasts for a short time while happiness is long-lived. Pleasure is visceral while happiness is ethereal. There are other intersections that pleasure and happiness can meet. The topic has several axes. it is not easy for me to mention all of them. Thanks for your ideas in advance.