We don't have synonyms for chain saws yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are chainsaw, chain saw and chainsaws.
(n) :
Alternative spelling of chainsaw. [(forestry, machinery, DIY) A power saw that has a power-driven and fast-revolving chain of metal teeth, usually used to cut trees.]
(n) :
Alternative spelling of chainsaw. [(forestry, machinery, DIY) A power saw that has a power-driven and fast-revolving chain of metal teeth, usually used to cut trees.]