Nouns come in a variety of forms. The most important types of nouns are common nouns, proper nouns, abstract nouns, possessive nouns, and collective nouns. A noun can be a person, a concept, a place , an object or a thing. It is easiest to design lessons using images for concrete nouns which can include countable and and uncountable nouns. However, it also interesting to attempt to design exercises with images that represent concepts represented by abstract nouns.