Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Roar (Noun)

A single roar like the roar of a mortar-battery.
—Rudyard Kipling

Roar … like the sound of a beast in pain.
—Rudyard Kipling

The roar of battle rose,
Like the roar of a burning forest, when a strong north wind blows.
—Thomas Babington Macaulay

Roaring like thunder borne upon the breeze.
—John Ruskin

Roar as of an ocean foaming.
—Percy Bysshe Shelley

Roar,
Like the din of wintry breakers on a sounding wall of shore.
—Bayard Taylor