The term 'thrillingly exciting' can be summed up with the word 'electric', which is an 8-letter word. Electric is often used to describe something that is exciting, stimulating, and full of energy. It is often used to describe a feeling of intense excitement or enthusiasm. Electric can also refer to something that is powered by electricity, such as an electric car or an electric guitar. In this context, it can be used to describe something that is thrilling and exciting.