The term SERB OR CROAT refers to two ethnic groups in the Balkans region of Europe. The Serbs and Croats are both Slavic peoples, and the term is used to refer to the two distinct cultures and languages that they share. The crossword solutions for this term are SLAV (4 letters) and SLOVENE (7 letters). SLAV is a term used to describe the various ethnic groups in Eastern Europe who speak a language belonging to the Slavic language family. SLOVENE is the language spoken by the SLOVENE people, who are an ethnic group native to Slovenia.