The mistaken use of a word that sounds much like the intended word,such as "infatuation" for "inflation," is

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A malapropism is the mistaken use of a word that sounds much like the intended word but has a completely different meaning. Spoilerism refers to an accidental swap of the first letters of two words, and verbal irony is the use of words to mean something different from what a person actually says. Understatement is an expression of meaning in a restrained way.

The Mistaken Use of a Word That Sounds Much Like