To understand you right, you are looking for an English-English Thesaurus of newer date.
The problem is that Pocketbook stopped selling them years ago due to probably some partnership problems. Some are still circulating, other sources have opened too. The best source I'm aware is the one I allready gave a link. I'm on a tight schedule today but will look at it the next days to see, what has been "harvested". Best you pm me with a working mail.
There was a thread about wiktionary on Pocketbooks that might be helpful too:
https://www.mobileread.com/forums/sh...d.php?t=337161
If you consider installing KoReader (it is only working on books without hard drm), there might be other sources too (Stardict dictionaries).