Rhyming Sing Along
Find sing alon songs that rhyme. Rhyming sing alongs are easier for children to sing along to because they only have to change some sounds of the words, not the whole word. This will get them exposed to more words, but also exposed to what rhyming words are.
Name Echo
You say something, they say something. Children love to copy what adults say, so use it to their advantage. Whenever you are using something, always say what you are using or what you are doing and then have your children repreat the word. This will expand thei vocabulary and get them familiar with identifying words with objects.