Final answer:
The sentence contains a metaphor, which is a type of figurative language that compares the giant's steps to thunder to emphasize their intensity.
Step-by-step explanation:
The sentence "the giant's steps were thunder as he raced after Jack" uses figurative language, specifically a form of metaphor. The giant's steps are not literally thunder, but comparing them to thunder emphasizes the loud, ground-shaking impact similar to what one would experience during a thunderstorm.
This metaphor serves to convey the intensity and enormity of the giant's movements as he chases after the character Jack.
The figurative language being used in the sentence "the giant's steps were thunder as he raced after Jack" is simile. A simile is a form of figurative language that compares one thing to another using the words "like" or "as".
In this sentence, the giant's steps are being compared to thunder, suggesting that the giant's steps were powerful and loud, just like thunder.