We post the high-frequency words outside the doorways in our school. One of our teachers had the great idea to do this school-wide! We are an ALL kindergarten school with 27 classes of kindergarten, so it's easier for us to this throughout our building.
We call them secret passwords. We focus on one word each week. The kids have to say the word before they enter their classroom, the library, gym, counseling and music. It's a FUN way to reinforce the words throughout the day. We also say the secret word during morning announcements. You can hear the kids all shout the word in the mornings.