Flankerback is a position in American football that involves a player lining up in the backfield and then moving out to a wider position on the field. This position is also sometimes called a slotback or a wingback. The term flankerback is not used as often as it once was, with many teams opting for different offensive formations that don't include this specific position. However, for those who do still use it, there are several synonyms that can be used, including split end, wide receiver, or just simply "flanker." Ultimately, the term used may depend on the team and their specific offensive strategies or preferences.