For the extreme nominalist, properties (e.g., redness) do not exist at all; only concrete particulars (individual red things) and the property words (e.g., the word red) true of them or the sets to which they belong (the set of all and only red things) exist. A second view of property agreement is called moderate nominalism. Advocates accept the existence of properties but hold that they are particular, individualized qualities called abstract particulars that cannot be possessed by more than one