We don't have synonyms for banksman yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are marksman, bondsman and batsman.
(n) :
(UK, civil engineering) The person who directs the operation of a crane or larger vehicle from the point near where loads are attached and detached.
(n) :
(UK, civil engineering) The person who directs the operation of a crane or larger vehicle from the point near where loads are attached and detached.