A fun way to get your children to use more words (and learn new words in the process) is to play an easy guessing game with picture cards. All you need is a bunch of cards with simple pictures on them, like coat, apple, rubber duck...anything, really!
You can use cards from a Memory game or you could just make your own from photos, magazines, or even clip-art.
In a 2 player game, it is noncompetitive. Each person takes a turn to draw a card, describe the picture, and try to get the other player to guess the picture.
For example, if you draw a card with a banana on it, you might say, "It is a yellow fruit that you peel, and monkeys like them, too." If your child gives up on a picture, take the opportunity to make a Teachable Moment and help her come up with words to say to describe the picture. This can be a great word-learning experience!
In a multi-player game, it is a competitive game to see which player can get the most cards. If you guess a picture, then you get to keep that card.
For a little extra enrichment, label each card under the picture. This way, you will be exposing your children to the written language as well, but still allowing non-readers to play.