This might be unpopular but I’m not going to use simpler vocabulary in my writing if it’s out of character for the narrator. If my POV character is a botanist, he’s going to call a plant by its name. If you don’t know what it is you can either Google it or move on just knowing it’s a plant of some sort.
I don’t like this trend of readers being angry that not everything is 100% understandable for them. I want my characters to be believable as people and sometimes people use words people outside of their field will not understand. That’s not a bad thing.
You don’t have to understand every word to get the gist of what’s happening. I’m not going to slow down an action scene to describe every weapon because someone might not know them by name. They can just assume it’s a weapon because that makes sense in the context of the scene.
I just had a debate with myself over using the word mezzanine, wondering if I should describe it instead. Ultimately I decided the character would call it a mezzanine, and therefore readers could look up a new word if they didn't know.
It's how I learned words like myriad as a seven year old reading Lord of the Rings for the first time, why would I steal that experiance from someone else by simplifying language?