NYT Connections Green Group Hint

There’s your visual hint for today’s blue group. It might be your eureka! moment. (No, sorry, that was not a clue.) Or it might not have helped at all. Hey, we try.
Here’s a verbal clue to go with this image of an English class: When you think of another word that goes well with these, put it after the word, not before.
Still nothing? We got serious gamer vibes today and spent a long time unsuccessfully trying to form a group around that idea, so after striking out, this was our “last 4 on the board” category of the day.
Today’s blue group answer is Prefixes and its words are PRO, RETRO, SUB, and SUPER