Read this sentence from the novel: They say his stomach was a cereal box and his heart a sofa spring. Which two types of figurative language devices are being used in the sentence?

The figurtive lanugage is metaphor

Explanation:

Metaphors are basically saying one thing is another

 He's a busybody, always poking his nose in everybody's business. He is incapable of recognizing the separate personalities of other people - he can only imagine them having the same motives and desires as himself. He tries to live vicariously through his son by sending Reynaldo to tempt Laertes into the vices of Polonius' own youth. He ascribes the lecherous character of his own youth to Hamlet. He tells his daughter "what to think." His meddling has tragic consequences for his children.