So, if bell peppers are in the same scientific classification as cayenne chili pepper, why aren't bell peppers hot? It comes down to a chemical compound called capsaicin. This chemical is the sole reason why a jalapeño is spicy and bell pepper is not. A bell pepper has no capsaicin. Capsaicin attaches itself to the mucous membranes in our mouths which in turn send out the fiery sensation. That heat in your mouth (or hands) will vary greatly depending on what type of chili pepper you've eaten. Peppers are ranked by their heat, or the amount of capsaicin they contain, on a scale called the Scoville Scale. Their capsaicin concentration is given a number on the scale and it is called Scoville Heat Units. Bell peppers do not have capsaicin, so they have zero Scoville Heat Units, therefore they are way at the bottom of the Scoville scale. 

Hungarian Paprika is often found in casseroles, white cheeses, chili, egg dishes, marinades, rubs, salads, stews and it also goes well with most vegetables, pork and rice dishes. 

Guajillo Chili Powder

Sweet Paprika or Regular Paprika Substitutes

Hot Sauce Around The World

Bell peppers, on the other hand, have a sweet and mild flavor, with no spiciness. The sweetness comes from the natural sugars in the pepper, which are more prominent in ripe peppers. Bell peppers come in a variety of colors, including green, red, yellow, and orange, and each color has a slightly different flavor profile. Green bell peppers are the least sweet and have a slightly bitter taste, while red, yellow, and orange bell peppers are sweeter and have a more fruity flavor. Bell peppers are commonly used in Mediterranean, Mexican, and Middle Eastern cuisine, and are a key ingredient in dishes such as fajitas, ratatouille, and stuffed peppers.

In conclusion, while paprika and bell pepper are both members of the Capsicum annuum species, they have distinct differences in terms of flavor, appearance, and usage.