I do have mild red-green color blindness although I'm not completely sure how the game is even supposed to work. So once you get a word wrong it shows new words that are still connected to the one you're trying to eliminate? But yes once the old words moved out of the green top 4 box I could not distinguish them from the rest.

So the rules are there is a highlighted word above the bottom 4. Type a word you think is semantically related to that highlighted word. Then the game will sort all words by its relation function. If the word you supplied is in the highest 4 (sorts to the bottom 4) then it explodes and you get a new word near the top of the list.

The words in the box are irrelevant once you explode a word because they are sorted by the old semantic relationship.

The highlighted word is light blue and all the other words are a medium grey. That's why I thought you might have a vision issue.

Click the eye icon to the right. It has colour-blind-friendly versions.