* "The letter A": The scarlet letter itself is a pun, as it represents both "Adultery" and "Able." Hawthorne uses this duality throughout the story, showing how Hester is both ostracized for her sin and seen as capable and strong by some.
* "Pearl": Pearl's name, a symbol of purity and innocence, is ironically juxtaposed with her rebellious and often outspoken nature. This is a subtle pun, playing on the contrasting meanings of the word "pearl."
* "The scaffold": The scaffold, used for both public shaming and executions, becomes a recurring motif. It's a word with dual connotations, representing both punishment and a platform for revealing the truth. This duality adds a layer of irony to the story, highlighting the hypocrisy and judgment present in the Puritan society.
It's important to note that Hawthorne's use of humor and wordplay in "The Scarlet Letter" is very subtle and often serves to highlight the complexities of the characters and the themes of the story. He does not rely on puns as a major comedic device, but rather uses them to add depth and nuance to his writing.