what devices are used in hamlet"s exchange about "worms?" explain the meaning and also the comment on its relation to act 5 scene 1

Hamlet uses a pun as a punchline for his joke about Polonius at supper being eaten by worms. This will be followed up by the metaphor of the cycle of life according to Hamlet. Worms eat from a king- beggar uses worm to catch fish-beggar eats fish- beggar excretes fish/king.