General terms:
* Malapropism: This is the most common term for using a word that sounds similar to the correct word but has a different meaning. For example, saying "douse the lights" instead of "house the lights".
* Misuse: A general term for using a word incorrectly, regardless of the reason.
* Error: This is a general term for any mistake, including using the wrong word.
More specific terms:
* Solecism: This term refers to a grammatical error, which can include using the wrong word.
* Mispronunciation: This refers to saying a word incorrectly, which can be a form of using the wrong word.
* Neologism: This refers to creating a new word, but sometimes it's used to describe the unintentional creation of a new word by misusing existing words.
Other factors to consider:
* Intent: Was the wrong word used intentionally, for example, to be humorous? Or was it an unintentional mistake?
* Context: The meaning of the wrong word might depend on the context in which it's used.
Ultimately, the best term to use will depend on the specific situation and the nuances of the language being used.