Back when I was teaching the entire world to write, I used the word “concrete” all the time. Now I know how abstract that word was for the people I was trying to reach. No word or idea is abstract if you know what it is, but if you don’t, it’s obscure. My “concrete” was abstract. In my effort to nudge them away from “big” words with ambiguous meanings I employed examples. Sometimes it worked, sometimes it didn’t.
I think of my niece when she was 2 and we were at a restaurant. She was running around and I was sort of “riding herd” on her to be sure she wasn’t getting into trouble. At one point I said, “Where are you going?”
She said, “There!” and pointed.
I said, “OK, but where’s THERE?”
She pointed and said, “THERE!!!”
I said, “Honey, you have to tell me where. THERE is too vague.”
“OK,” she said, “I’m going to vague!”