Is there some way of unignoring this word without sifting through 6000 words to find it? like a search tool or something?
Have you learned all the 6000 words and you were just reviewing a finished course? Otherwise you can search for the level and use ignore none
If you have large levels, you could decide to just go through the levels. At the top you can see if you’ve ignored any words in that level. If you have you can search for “Ignored” in the level (Ctrl+F).
If you have small levels, you could decide to export all the text from the course using something like https://www.import.io/ and again search for “Ignored” in the result.