Final answer:
In a pun, words are played with for humorous or rhetorical purposes. The pun in 'four-letter hops' plays on the word 'hops' to create a humorous connection.
Explanation:
A pun is a play on words, often for comedic effect, relying on a word having two meanings or sounding like another word. In the phrase 'four-letter hops,' the pun lies in the word 'hops,' which can refer to jumps (literal or metaphorical) or be a play on 'hops' as in the plants used in brewing beer, linking it to 'four-letter' words.
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