This paper examines the properties of plural mass nouns in Greek. It puts forth a split analysis of plural Number, according to which there are two types of plural, a so-called grammatical plural and a so-called lexical plural. The former is on the Number head and realizes a plural semantic feature. The latter is on n (it is a categorizing head). On this view, plural mass nouns are simple nPs. The paper then examines why argument supporting nominals, which have been argued by Grimshaw (1990) to be mass nouns, are incompatible with the latter type of plural. The explanation offered is that since the nominalizing affix and lexical plural both realize n, they are in complementary distribution.