does פלפל refer to capsicum, chilli and actual pepper (corns)? Or just some of those?
It really could be any of the above. פלפל שחור = black pepper, פלפל חריף = chili pepper, פלפל אדום/ירוק/כתום for bell peppers depends on their color.
Note: in actual spoken Hebrew, rather than prescriptively ‘correct’ Hebrew, people pronounce it pílpel (pl. pílpelim).
It was pronounced pilpil once, but now its pronounced pilpel. Which one is correct?