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We have Delusions of Eloquence for when characters use fancier-sounding words incorrectly, but it's a "No Real Life Examples Please" article, so not one we're supposed to apply to real authors' prose. Related tropes that we can apply to real authors are Purple Prose (a more general trope about fancy writing that inhibits clarity) and Author Vocabulary Calendar (about certain big words recurring in a work, in a way that doesn't feel completely natural).
I didn't write any of that.
When they are being corrected by another character, it becomes You Keep Using That Word.
Does You Keep Using That Word work for meta examples (i.e the author keeps misusing the word, rather than a character in the work)?
That's what the trope was about before TRS decided to drop the out-of-universe use for their complaints. UsefulNotes.Commonly Misused Words still lists common errors of the kind.
Beware also of words where alleged misuse is more along the lines of Common Knowledge- there are a number of these that get promoted by the same crowd that invented the nonsense about split infinitives and not ending sentences with propositions.
Edited by Scorpion451
A writer looks up a "fancier" synonym for a "normal" word in a thesaurus but ends up using it wrong, since, despite technically being a synonym, the word has a very different connotation, or is being used in the wrong context.