Inquiry - Increasing vocabulary through class stories

Over Term 3 we have been taking the time to read our class lots of stories that they have chosen at the library. They all love listening to stories and will often seek clarification on new words they hear. Seeing they are so engaged during this time I am wanting to find a way to use this time to build on their curiosity. I have thought about maybe creating a word wall or a word map but am still trying to think of a way to make it a quick lesson that does not take away from the reading for enjoyment factor. If you have any suggestions please comment below!