Hi, I'm Greg. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
There are several methods that could be used. Many teachers, to incorporate this, will use word walls or they will label items around the room with the words. For example, under the clock would be a small sign that said clock and near the pencil sharpener would be a sign that said pencil sharpener. In this way, kids are naturally starting to "see" the words for common objects without actually realizing it and it starts to build in their minds. A visitor would be able to see this by the signs on the common items in the classroom.