Leaders of the pack is a phrase used to describe those who are at the forefront of a group, setting the pace and leading the way. Pacemakers (11 letters) are those who set the pace for others to follow, pacers (6 letters) are those who keep up with the pace set by the pacemakers, alphas (6 letters) are those who are in charge of the group, and ACES (4 letters) are those who are the best at what they do. Together, these four terms describe the leaders of the pack.