끝말이기 (geut-mahl-ee-gee) is a vocabulary spelling game, where students have to make new words starting with the last letter in the previous word. For example, Student A says 'Apple', as apple ends with 'e', Student B would have to come up with a word that starts with 'e', etc...

This can either be done verbally or you can have the students come up to the whiteboard and write.