Which term represents a sentence in which word is humorously misused?

The term that represents a sentence in which a word is humorously misused is called a malapropism.

This is a type of verbal blunder where a word is used incorrectly, often in a humorous way, because it sounds similar to the intended word.

Example:

"Let's go to the *library* to get some *stationary*." (The correct word is "stationery", but the speaker has mistakenly used "stationary" because it sounds similar.)