The Collaborative International Dictionary of English v.0.48:

Burghermaster \Burgh"er*mas`ter\, n.
   See Burgomaster.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "burghermaster":
   alderman, archon, bailie, burgomaster, cabinet member,
   cabinet minister, chancellor, city councilman, city father,
   city manager, commissar, commissioner, councillor, councilman,
   councilwoman, county commissioner, county supervisor, elder,
   headman, induna, legislator, lord mayor, magistrate, maire, mayor,
   minister, minister of state, portreeve, reeve, secretary,
   secretary of state, selectman, supervisor, syndic, undersecretary,
   warden