We don't have synonyms for sirin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are siren, siris and sarin.
(N) :
a mythological creature of Russian legends, with the head of a beautiful woman and the body of a bird (usually an owl), borrowed from the siren of the Greek mythology.
(N) :
a mythological creature of Russian legends, with the head of a beautiful woman and the body of a bird (usually an owl), borrowed from the siren of the Greek mythology.