malapropism
Pronunciation:
/ˈmæləpɹɒpɪzəm//ˈmæləpɹɑːpɪzəm/noun
Definitions
The blundering use of an absurdly inappropriate word or expression in place of a similar-sounding one.
Example: The script employed malapropism to great effect.
An instance of this; malaprop.
Example: The humor comes from all the malapropisms.