Whenever you can, play word games with your kid. It expands their vocabulary and costs nothing. My games with Angel started accidentally on Saturday.
Angel: Mommy, when I say 'me, too', can you say 'me, three'?
Angel: Me too.
Me: Me three.
Pause. Then I decided to continue.
Me: Me book.
Angel's face lit up and she said: Me pencil.
Me: Me bed.
Angel: Me pillow.
Me: Me water.
Angel: Me dishes.
It went on the whole night! And you'll be surprised what they associate with certain words.