We don't have synonyms for bushhammer yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are bush hammer and burkhammer.
(n) :
Alternative form of bush hammer. [A square-headed hammer with spikes used in stoneworking to either even the surface before polishing, or give it a pockmarked and weathered aspect.]
(n) :
Alternative form of bush hammer. [A square-headed hammer with spikes used in stoneworking to either even the surface before polishing, or give it a pockmarked and weathered aspect.]