When you read to your child, take the time to stop and talk about some of the words in the story. Many times, we take for granted that the child understands all the words. A good way to make sure they do is to ask your child if they know what the word means and have a discussion about it.
When you go somewhere special with your child, let him bring back a memento. Then, have a show and tell in front of the entire family. Let your child show off his treasure and talk about what he learned when he went to the place it came from.
Always point out things and name them. Even if you think the words are too advanced for your child. A young child’s mind is like a sponge and they will remember some of the larger words easier than some of the little words.