We don't have synonyms for boldon yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are bolson, bolton and baldon.
(n) :
A group of three villages in the Metropolitan Borough of South Tyneside, Tyne and Wear, England: Boldon Colliery (OS grid ref NZ3462), East Boldon (OS NZ3661) and West Boldon (OS NZ3561).
(n) :
A group of three villages in the Metropolitan Borough of South Tyneside, Tyne and Wear, England: Boldon Colliery (OS grid ref NZ3462), East Boldon (OS NZ3661) and West Boldon (OS NZ3561).