9 letters · 25 points in Scrabble
originBorrowed from Russian чернозём (černozjóm, “black soil”). The letter ё (jo) is usually written as е (je) in Russian, more accurately transliterated as "chernozyom"; compare чернозе́мье (černozémʹje), where ё (jo) is changed to е (je).
Etymology from Wiktionary, CC BY-SA 3.0