People doing research on dyslexia or other learning disorder symptoms (like the overly literal interpretations that autistic people have) might have found something interesting. Dyslexia isn't just a reading problem, they can also make characteristic mistakes when speaking and listening to words. Learning disorder research is not quite directly applicable to the average population (though I read somewhere that 1 in 6 has a learning disorder) but doing something like searching for the words to describe dyslexic errors might lead you to interesting places.
There's plenty of experimental work about how humans make poor judgments and decisions, but I haven't yet found much about how humans make poor judgments and decisions because of confusions about words. And yet, I expect such errors are common — I, at least, encounter them frequently.
It would be nice to have some scientific studies which illustrate the ways in which confusions about words affect everyday decision making, but instead all I can do is make philosophical arguments and point people to things like Yudkowsky's 37 Ways That Words Can Be Wrong or Chalmers' Verbal Disputes and Philosophical Progress.
Which keywords do I need to find experimental work on this topic? I tried Google scholar searches like "fuzzy concepts" "decision making" and effect of connotations on choices but I didn't find much in my first hour of looking into this.