hierro
/ˈʝero/ · B1 · noun · m
iron
🔩 Latin ferrum (Fe) → hierro: Spanish swapped Latin f for a silent h
Old Spanish turned Latin f- into h-, which later went silent: ferrum → fierro → hierro, like facere → hacer and filius → hijo. Fe on the periodic table shares the root. The h is silent, so say YEH-rro.