We don't have synonyms for swing bridges yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are swing bridge and swingbridge.
(n) :
A movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its centre of gravity, about which the turning span can then pivot horizontally.
(n) :
(New Zealand) A rope bridge, or simple suspension bridge, which swings (oscillates) as pedestrians walk across.
(n) :
A movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its centre of gravity, about which the turning span can then pivot horizontally.
(n) :
(New Zealand) A rope bridge, or simple suspension bridge, which swings (oscillates) as pedestrians walk across.