We don't have synonyms for bulgars yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are bulgar, bulgari and bulgers.
(N) :
The (also Bulghars, Bulgari, Bolgars, Bolghars, Bolgari, Proto-Bulgarians) Turkic semi-nomadic warrior tribes that flourished in the Pontic–Caspian steppe and the Volga region between the 5th and 7th centuries.
(N) :
The (also Bulghars, Bulgari, Bolgars, Bolghars, Bolgari, Proto-Bulgarians) Turkic semi-nomadic warrior tribes that flourished in the Pontic–Caspian steppe and the Volga region between the 5th and 7th centuries.