This study aims to investigate to what extent Swedish upper secondary school learners of L2 English understand the meanings of polysemous words and whether puns can be used to teach such words. A test and two questionnaires were constructed to retrieve data from both students and teachers. The results of the study show that Swedish upper secondary school learners of L2 English generally have an acceptable knowledge of polysemous words, but depending on the type of program the students are attending, their understanding differs. Based on these results, it was also concluded that puns can be used in education to teach students about the meanings of polysemous words. The results from the questionnaires display that students in general have a positive attitude towards using puns in the classroom and that they found them entertaining and humorous. In addition, the students also saw this approach as beneficial to their retention and motivation. Lastly, the teachers expressed that using humor can strengthen the learning process, and if the students find the teaching situation enjoyable, they learn faster and it can increase their retention.