 If either of the above accounts are successful, substances, properties and events are distinguished. The question remains, however, how far these are nominal and how far real distinctions. That there is a difference between substance concepts and property concepts has definitely been shown, but does it follow that there are, in reality two different kinds of thing, namely properties and substances? The answer might seem to be obvious. Given that there are substance concepts, if those concepts are instantiated, then there are substances in reality. Cat, table, human being, are substance concepts by the above accounts, and there are cats, tables and humans, so there are substances in reality as well as properties.