Capsicum.

Too many things are called pepper. Look within you, for you know it to be true.

Capsicum. No fucking ambiguity there. Also Capsicum spray. I didn't realise until I heard that term that pepper spray wasn't just like loads and loads of essence of black peppercorns because that seems like it'd really hurt if it got in your eyes.

Feel free to start a subthread of things that are called pepper that are different.