This teaching nouns lesson plan is suitable for any aged student, from first grade to twelfth grade. I understand that it is a little elementary for high school students, but this is one of those concepts that students really have a difficult time understanding.
First step, teachers, hand out the construction paper, glue, and scissors to make sure students have fun while learning. If students have fun, this activity is more likely to stick with them, and they might just learn the lesson you are teaching.
On a piece of construction paper, have students cut any shape--a circle, a flower, or whatever, and then, have students write their names in the middle of their shape.