The term 'one who fights in a ring' can be summarized as a MATADOR, which is a seven-letter word. A MATADOR is a professional bullfighter in Spain and Latin America who is responsible for killing the bull during a bullfight. Matadors are usually dressed in traditional clothing and use a variety of techniques to control and kill the bull. They are considered to be skilled athletes and their performances are often judged by a panel of experts.