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the meaning between "roar" and "growl" - WordReference Forums : Thus the roar will be heard from farther away. When you are in your flimsy hut, sleeping, you could hear the lions roaring in the distance. If you hear them growling, they are on your doorstep and you are in big trouble.
Roar vs Howl - WordReference Forums : Apart from laughter, roar and howl have very different uses, not particularly based on loudness. Lions roar and hyenas howl, I think. Howling tends be associated with eeriness, winds, frightening nightmarish situations, and whining animals such as dogs. Roaring tends to be associated with force and power, such as the roar of a lion or a jet engine.