Anecdote that isn't remotely data: I went to an urgent care facility the first time I had a migraine aura without headache. I described it to the receptionist as a "visual hallucination", since it was a flashing checkerboard pattern that obviously wasn't real.

The receptionist _ran_ to the back to get a doctor. The doctor, in an exam room, very careful, and with significant compassion, explained that they don't have the ability to treat me at that location -- but would I accept an ambulance if they called it?

I took an Uber to the ER, where the admitting nurse gave me a flat stare and said "That's not a hallucination," but still put me at the front of the line to have an attending doctor and a bunch of students stare into my eyeballs before confirming that it was a headacheless migraine.

To this day, I use that experience as an example of a lay person and a professional completely failing to understand each others' word choice.