First of all, I’ve never heard of a thesaurus paper. Is this something you are accused of having written?
My guess is that a thesaurus paper is one in which someone looks through the thesaurus to find synonyms that sound more erudite that the words one has thought of. Such papers are perfectly obvious because they sound awkward, and the synonyms generally stand out like a block of obsidian on a field of snow.
I have often heard this in other people’s speech. I think people try to do it because they believe that big words make them sound more educated and make their words more weighty. The problem is that half the time, they use the words incorrectly. It makes them sound foolish, not wise.
I suspect a “thesaurus paper” does the same thing. It’s funny, because if you express your ideas in words you understand well and are comfortable with, you’ll come across as smarter than you do trying to use fancy synonyms. Your ideas will be expressed more clearly, and that’s the whole point.
Good writing is not about big words. It better not be, or I’ll be in trouble. My writing, according to one writing analysis app, is quite simple. Grade school level. That bothered me at first, but then I thought that maybe I’m writing to be understood, not to show off,.
I’m sure I do use words other people don’t understand occasionally, but I only use them when I feel comfortable with them. Most of the time, these days, I know there’s a word out there for the idea I am trying to convey, but I just can’t remember it. Sometimes I’ll go to the thesaurus to try to find it. Sometimes I do find it. Other times I have to make do with the words I can remember.
I think my way works. Many people have written me privately to say that I write well, or that my ideas are interesting to them. I say this to illustrate that simple words work. The thesaurus should be used sparingly, and only when truly necessary.