After you have taught your kids that a noun is a person/animal, place, or thing you can have them complete the noun tree map. Depending on their ability you can have them write or draw the noun. You could even have them cut out pictures from magazines and glue the pictures in the correct box.
Click below to download the noun tree map in English and Spanish.
We also made a noun town. I had lots of small white construction paper squares and let the kiddos draw their hearts out. They loved this activity and came up with some amazing nouns. I especially liked the things they drew for people to hold.
This idea is from First grader . . . at last!