This is the 4463rd most frequent Russian word.
волк
Wolf.
Here, 'волк' is used literally to refer to the animal, wolf.
В лесу живёт серый волк.
In the forest lives a gray wolf.
In this sentence, 'волк' is used metaphorically to describe someone's character traits.
Он как волк, всегда одинокий и свободный.
He is like a wolf, always lonely and free.
Here, 'волк' is employed to evoke imagery or exaggerate a reaction to fear.