A vocabulary of landscape — a landscape of words 975 entries

avalanche

 AV-uh-lanch
A mass of snow, ice, and debris sliding rapidly down a mountainside. The word is clinical but the thing itself is not — an avalanche can move at 200 miles per hour.
Etymology
French, from the Alpine dialect avalanche, alteration of lavanche, possibly from Latin labina (a sliding, a landslide), from labi, to slip.