Learning vocabularies is an essential task when learning a foreign language. However, most learners seem to experience similar difficulties in learning vocabularies in terms of large burden and a lack of motivation. In this paper, we propose an approach for web-based vocabulary learning through personalized word association games. By applying game-based learning, we aim at making vocabulary learning more attractive and more fun for learners. On the other hand, personalized learning has high potential to make vocabulary learning more effective by suiting the learning process to the students' individual needs. The paper shows how these two learning concepts can be integrated in an educational system, demonstrating the architecture and functionality of a personalized, game-based vocabulary learning system.