adjectives are used to describe so use examples of how nouns can also describe other nouns. for example, i asked my students to give me some food nouns, they came up with cheese, strawberry, ham, apple etc...   so i made the list and gave them another list with a few words that we could combine with the ones they gave, like sandwich, juice, cake.  then i asked them to tell me which words could describe  what kind of sandwich someone could buy. they say cheese, ham,  or what kind of juice or cake... that way they realized that nouns can also be used to describe.