The given words "pact, jack, bat, decked, blacked, react" can be divided into two groups based on their meanings. The words "pact, jack, bat, decked" do not have any clear connection or similarity in meaning. However, the words "blacked, react" both have a common theme related to color or appearance. Therefore, "blacked, react" can be seen as the correct answer as they form a distinct group within the given words.