malapropism

This term describes a specific type of linguistic error where a speaker replaces a word with another that sounds similar but has a completely different meaning. The resulting phrase is typically nonsensical or absurd, creating a comedic effect that often makes the speaker appear pretentious or confused.

While a slip of the tongue (spoonerism) involves swapping sounds between words, a malapropism involves the substitution of an entire word. It is frequently used in literary contexts to characterize comic relief figures who attempt to use sophisticated vocabulary but fail, thereby undermining their own perceived authority.