roar

A roar is a loud sound that some animals make, for example lions and tigers

Example: We heard the lion's roar from more than a kilometer away.

If an animal, for example a lion or tiger, roars, then it makes a loud sound.

Example: I felt scared when I heard the tiger roar in the zoo.

If a person roars, it means they make a loud shouting sound, similar to a lion or tiger or similar animal.

He roared with laughter at the funny joke.