I am sure we all play, or have played, pelmanism games in our classes. But most people do words that match, or have some similarities. "Opposition" is a pelmanism game, that works exactly the same as all others, but the students have to find pairs of opposite words. E.g. "Yes" and "no", "black" and "white" and "big" and "small". I believe Einstein said something about opposites at some point, they are important and useful for students to study.
You just need to cut the cards, shuffle them and place them ice down on the floor or table for the students to turn over and find. There are 50 pairs of words in total (100 words), but you don't have to use all of them.