Malapropisms

Malapropisms are so named for Mrs Malaprop in a 1775 play The Rivals
The word malaprop makes a person think of mal=bad and aprop = appropriate

a Malapropism substitutes an incorrect word for another word of similar pronunciation.

sometimes the mistaken word interpreted simultaneously by the brain gives a double meaning:
"you should be careful not to jump to confusions" (instead of conclusions)

Baseball player Yogi Berra was prone to malapropisms, actor Mike Smith (who said "it's got lots of installation in it (instead of insulation) and more recently George Bush, who said
(among other slips) "we need an energy bill that encourages more consumption (instead of conservation)

Also known as Dogberryisms named for the Shakespearean character Dogberry in
Much Ado about Nothing who said such things as
"our watch, sir, have indeed comprehended two auspicious persons" (apprehended two suspicious persons)