The literary device used in the title of the play The Importance of Being Earnest is pun simile.
What is pun simile?
Pun simile is a literary device that uses humor in the words. A pun is generally played with homophones or words with the same pronunciation.
The word earnest/Ernest points to the use of puns in the title of the play. Therefore the correct option is Pun simile.
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