Bulgaria is a country located in the southeastern part of Europe, bordered by Serbia, Turkey, and other SLAVIC and BALKAN countries. The term 'Bulgarian Neighbor' can refer to any of these countries, as well as the capital cities of Sofia and Varna. Specifically, the crossword solutions for this term are SERB (4 letters), TURK (4 letters), SLAVIC (6 letters), BALKAN (6 letters), SLAV (4 letters), LEV (3 letters), LEVA (4 letters), SOFIA (5 letters), and VARNA (5 letters). These words all refer to either a country or a city that borders Bulgaria.