The story
- Proto-Indo-European*ǵwelH-
- Proto-Indo-European*ǵwl̥Hom
- Proto-Indo-European*ǵulHom
- Proto-Germanic*kulą
- Proto-West Germanic*kol
- Old Englishcol
- Middle Englishcol
- Englishcoal
- English todaycoalification
From coal + -ification.
Etymology from Wiktionary, CC BY-SA 4.0.