The difference between Catachresis and Malapropism
When used as nouns, catachresis means a misuse of a word, whereas malapropism means the blundering use of an absurdly inappropriate word or expression in place of a similar-sounding one.
check bellow for the other definitions of Catachresis and Malapropism
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Catachresis as a noun (often, especially):
A misuse of a word; an application of a term to something which it does not properly denote. Such a misuse involving some similarity of sound between the misused word and the appropriate word.
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Catachresis as a noun (rhetoric):
A misapplication or overextension of figurative or analogical description; a wrongly-applied metaphor or trope.
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Malapropism as a noun (uncountable):
The blundering use of an absurdly inappropriate word or expression in place of a similar-sounding one.
Examples:
"The script employed malapropism to great effect."
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Malapropism as a noun (countable):
An instance of this; malaprop.
Examples:
"The translator matched every malapropism in the original with one from his own language."
"The humor comes from all the malapropisms."