We don't have synonyms for keris yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are eris, keres and kermis.
(n) :
(chiefly Malaysia, Brunei, Singapore) Alternative spelling of kris. [A traditional Indonesian, Malaysian, or Filipino sword or dagger having a tapering, usually serpentine blade.]
(n) :
(chiefly Malaysia, Brunei, Singapore) Alternative spelling of kris. [A traditional Indonesian, Malaysian, or Filipino sword or dagger having a tapering, usually serpentine blade.]