What's the word meaning the use of the wrong word?
For instance, calling a "theft" a "robbery".
What's the word meaning the use of the wrong word?
For instance, calling a "theft" a "robbery".
One form of wrong-word-use is malapropism
the unintentional misuse of a word by confusion with one of similar sound, esp when creating a ridiculous effect, as in I am not under the affluence of alcohol
Another is misnomer
an incorrect or unsuitable name or term for a person or thing
And there is always that broader explanation (not limited to simple word substitution) by politicians, that they misspoke
to speak incorrectly, improperly, or misleadingly
A little uncommon, but it's really specific for what you need: catachresis:
A misuse of a word; an application of a term to something which it does not properly denote.
Malapropos:
in an inopportune or inappropriate way.
Oxford Dictionaries