Bell peppers and capsicum aren’t different as bell pepper is capsicum same like capsicum is like another bell pepper. It is named differently in different places and countries. It is called capsicum in India, New Zealand, and Australia. In Indian English, the word “capsicum” is used for bell pepper.
In Britain, it is called red pepper, green pepper, or chili pepper whereas in the Canada and U.S., the large capsicum is known as bell pepper.
The name pepper came into use as the plants were hot but there is no botanic association with this plant nor with Sichuan Pepper.
Bell Peppers vs Capsicum
The difference between bell peppers and capsicum is the presence of capsaicin which is a lipophilic chemical that has a burning sensation in the mouth. Whereas bell peppers do not have this chemical. It has non-existence capsaicin because of its lowering genetic factor that washes out this chemical.