We don't have synonyms for miters yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are miter, mites and kiters.
(n) :
(American spelling) Alternative form of mitre. [A covering for the head, worn on solemn occasions by church dignitaries, which has been made in many forms, mostly recently a tall cap with two points or peaks.]
(v) :
(American spelling) Alternative form of mitre (“to unite at an angle of 45°”). [To adorn with a mitre.]
(n) :
(American spelling) Alternative form of mitre. [A covering for the head, worn on solemn occasions by church dignitaries, which has been made in many forms, mostly recently a tall cap with two points or peaks.]
(v) :
(American spelling) Alternative form of mitre (“to unite at an angle of 45°”). [To adorn with a mitre.]