What are some figurative language in Boy in the Striped Pajamas?

Simile:

"Say goodbye to them?" he repeated, sputtering out the words as if his mouth was full of biscuits that he'd munched into tiny pieces but had not actually swallowed yet."

Personification:

Bruno had a pain in his stomach, and he could feel something growing inside him.

Onomatopoeia"

Bruno liked nothing better than to get on board the banister at the top floor and slide his way through the house, making whooshing sounds as he went.