otoño
/oˈtoɲo/ · B1 · noun · m
fall
🍂 otoño and autumn are twins: both come from Latin autumnus
Say the two words side by side: au-TUM-nus became o-TOÑ-o in Spanish. The mn sound turned into ñ, just as Latin somnus (sleep) became sueño. It is masculine: el otoño.