Full Idea
Resemblance Nominalism is clearly superior to Class Nominalism, since the former offers a clear ground for distinguishing between natural and unnatural classes.
Gist of Idea
Unlike Class Nominalism, Resemblance Nominalism can distinguish natural from unnatural classes
Source
J.P. Moreland (Universals [2001], Ch.2)
Book Reference
Moreland,J.P.: 'Universals' [Acumen 2001], p.35
A Reaction
Important. It seems evident to me that there are natural classes, and the only ground for this claim would be either the resemblance or the identity of properties.