These cards can be used whole group, small group, or in centers. Use all the cards, or just a few sets of cards, depending upon your group levels. You could even divide the cards into several small groups, have the groups record the synonyms or antonyms, then report them back to the class. There are many ways to use them.
The synonyms are round with a flower inside. One synonym has a green border, the matches have pink.
The antonyms are also round. One antonym is purple with yellow, the matches have yellow with purple. (see thumbnail picture)