We don't have synonyms for theatres yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are theater, theatrics and theatre.
(n) :
(Canada, South Asia, rarely Australia, New Zealand) A cinema; movie theatre.
(n) :
(chiefly Australia, Canada, New Zealand, UK) Alternative spelling of theater. [(countable) A place or building, consisting of a stage and seating, in which an audience gathers to watch plays, musical performances, public ceremonies, and so on.]
(n) :
(Canada, South Asia, rarely Australia, New Zealand) A cinema; movie theatre.
(n) :
(chiefly Australia, Canada, New Zealand, UK) Alternative spelling of theater. [(countable) A place or building, consisting of a stage and seating, in which an audience gathers to watch plays, musical performances, public ceremonies, and so on.]