Synonyms for Pioneer (same or very similar meaning)
WordNet sense 1 (someone who helps to open up a new line of research or technology or art):
innovator, trailblazer, groundbreakerWordNet sense 2 (open up an area or prepare a way):
open upWordNet sense 3 (take the lead or initiative in; participate in the development of):
initiate, initiateFrom the ODE community, based on WordNetadd/edit