Acyrologia

Acyrologia (ak-ir-o-lo'-gi-a) is an unintended use of the wrong word often by someone attempting to sound educated or erudite. “O, villain! Thou wilt be condemned into everlasting redemption for this!” Much Ado About Nothing, 4.2.38. Dogberry used “redemption” instead of “damnation.” The modern term for this figure is malapropism.  Malapropism is a neologismA new, deliberately invented word. inspired by the name of the character Mrs. Malaprop, in Richard Sheridan's The Rivals, 1775. Her name is an abbreviated portmanteauA neologism created by combining two words. that combines the prefix mal. meaning bad, with appropriate.