These should be in another place in the room. Your word wall should be visible to all students in the classroom. Five words go up weekly. These 5 words should be practiced 2-3 times a week. Teach onsets and rimes.
Onsets are all the letters up to the first vowel and rime is the rest of the word.
You uncover the onset first after students have made several guesses as to what the word is. By revealing the onset first, you probably can eliminate some of their guesses. Then you reveal the rime. Once the WWW's are up, don't forget them. You need to constantly review these as well, with the many activities that have been mentioned.