forerunners, predecessors, antecedents, harbingers, pioneers, trailblazers, progenitors, initiators, originators, forebears, ancestors, precursors
forerunners, predecessors, antecedents, harbingers, pioneers, trailblazers, progenitors, initiators, originators, forebears, ancestors, precursors
forerunner, predecessor, harbinger, antecedent, pioneer, trailblazer, precursor, forebear, ancestor, originator, initiator, herald, vanguard, prototype