Begin with a vocabulary word. Provide it's definition and part of speech. The next poster takes the last letter and builds a word from that. For example: Poster 1 would say "turtle: a type of shelled animal (noun)", while the second would follow by saying something along the lines of "enlarge: to make bigger (verb)"
It is your choice whether to follow with a sentence or not.
Let's start with:
eclectic (adjective)
composed of elements drawn from various sources
To combat the extraterrestrial invasion, an eclectic band of farmers, businessman, and doctors was formed to tackle the alien menace