Pun is used by Oscar Wilde in the title of his play The Importance of Being Earnest
Literary device
A literary device is a tool used by writers to hint at larger themes, ideas, and meaning in a story or piece of writing
Pun refers to the use of similar sounding words with different meaning in order to achieve some sort of comedic value. There is one of character in the play named ernest and other character’s live is revolved around this character (ernest similar sounding words as earnest).
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