Question

Which poetic device is used when Silverstein writes, "and watch the way the word-web weaves"

Answer 1

The best answer for the first question would be alliteration, because the letter W occurs in consecutive and/or adjacent words in the sentence "Watch the way the word-web weaves". 

For the second question, the best answer would be hyperbole, since the sentence contains exaggeration.

For the third question, the best answer would be personification, since a human element is added to inanimate objects. 

Hope my answer has come to your help.