Let's consider the sound of a roar. It can be used in many a context other than that of for describing an animal's loud cry (like that of a lion or a tiger). For example, it can be said:
(i) As I approached the quay, I could hear the thunderous roar of the surf.
- This is a reference to the sound of a heaving sea.
(ii) The truck roared past the pedestrians waiting at the crossing at great speed, nearly knocking one of them down.
- Here, it is used with reference to the loud sound emitting from a vehicle.
(iii) Jake was roaring drunk, making an utter nuisance of himself at the party.
- This is to indicate that Jake was extra loud & noisy.
In a way not related to actual sound association, the word roar can be used like this: Kamini presented the topic so well at the seminar, that it was a roaring success.
- Here, the word roar means huge.
Keep smiling...one day life will get tired of upsetting you.