Synonyms for Chief (same or very similar meaning)
WordNet sense 1 (a person who is in charge):
head, top dogWordNet sense 2 (a person who exercises control over workers):
boss, foreman, gaffer, honchoWordNet sense 3 (most important element):
main, primary, principalWordNet sense 4 (of great significance or value):
of importFrom the ODE community, based on WordNetadd/edit