Domains on the Border: Between Morphology and Phonology

In this dissertation, I show that a difference in structure between functional and lexical items has a restricting effect on both the morphology and the phonology. Morphologically, we observe two asymmetries: (i) in lexical nouns, number-driven root-suppletion is com-mon whilst case-driven root-suppletion is virtually unattested; (ii) in contrast, pronouns commonly supplete for both number and case. By and large, we see the same pattern in verbs, observing a contrast between lexical verbs and auxiliaries with regard to suppletion for aspect and tense. In order to account for these asymmetries, I appeal to structural differ-ences between lexical and functional material, combined with locality effects as proposed in Distributed Morphology (Halle & Marantz 1993). Crucially, lexical material contains a category-defining node which has a delimiting effect that causes case/tense to be insuffi-ciently local to the root to condition its suppletion. In contrast, functional material lacks category-defining nodes and thus no delimiting effect is observed and case/tense are free to condition suppletion of the functional base. Phonologically, we see a correlation between the presence of a category-defining node and the absence of dominant prefixes in vowel harmony and lexical accent, whilst in the absence of a category-defining node dominan