What is the word that is used to describe the actual taste of a red pepper?

The word to describe the actual taste of a red pepper is "sweet" and "crisp."

I'm referring to the spice Red pepper,what is the taste of it?

The taste of red pepper spice is typically described as hot, spicy, pungent, and intense. It can range in heat levels depending on the variety used, with some types being milder and others being very hot.