 Even if we are happy to commit to properties, problems remain. Just as a paucity of properties can create problems (nominalism), so can a plenum of properties. We’ve already seen that expressions for artificial kinds and properties like ‘livestock’ might create troubles. There’s a different sort of problem raised by still-more artificial properties: a worry arises that allegedly non-rigid designators for properties always end up rigidly designating some gruesome relational property or other in the plenum. Consider ‘the biological species typically farmed for honey’, which we might initially be inclined to take for a nonrigid designator of Apis mellifera. “In virtue of what,” as Devitt would ask (2005, p. 154; see also 2009, p. 240), does such an expression “nonrigidly designate that,” i.e., Apis mellifera, rather than rigidly designate the property being the biological species typically farmed for honey? This problem has been much discussed. Whether indeed there is a problem here might depend on whether expressions for properties are singular terms or whether they are predicative. Arguably the problem is more tractable for singular terms than for thoroughly predicative terms, which seem especially unaccommodating. 