In Moroccan Arabic, like in many other Afroasiatic languages, certain nouns may have more than one plural form. For instance, t ʕ es ʕ wera ‘photo’ has plurals t ʕ s ʕ awer and t ʕ s ʕ werat. However, their diminutive systematically resorts to -at suffixation in the plural. The aim of this study is twofold. First, it presents an interface approach which aims to determine the structural location of number and capture the empirical contrast between broken and sound plurals. It is argued that the sound plurals are associated with the standard Num projection, whereas the broken plurals are associated lower in the structure with the n projection. Second, it provides a templatic analysis of the diminutive formation, showing that the diminutive and the internal plural markers compete for the same templatic position. External evidence for the analysis is drawn from the phenomenon of emphasis spread. The nP is presented as the maximal domain of emphasis spread in nouns.