Capital fellow refers to someone who is exceptionally skilled, knowledgeable, or gifted. When it comes to synonyms for capital fellow, there are several options to choose from, depending on the context. One alternative is "ace," which implies that someone is the best in a particular area. Another similar term is "whiz," which suggests that someone possesses an exceptional ability in a particular subject. "Prodigy" is another related term, which refers to someone with exceptional talent and intelligence at a young age. "Maestro" is yet another term used to describe someone with exceptional skills in the arts, such as music or painting. Overall, there are many great synonyms for capital fellow that capture the idea of exceptional talent and skill.