........................................................................................................................................ ii List of Tables ............................................................................................................................... iv List of Abbreviations .................................................................................................................... v Chapter 1 Semantic Clustering ..................................................................................................... 1 Theoretical foundation ...................................................................................................... 1 Evidence ........................................................................................................................... 2 Chapter 2 Phonological Clustering ........................................................................................... 18 Theoretical foundation .................................................................................................. 18 Evidence ......................................................................................................................... 19 Chapter 3 Methodology ............................................................................................................ 25 Chapter 4 Results ...................................................................................................................... 29 References ................................................................................................................................. 38 Appendix 1 Word categories ...................................................................................................... 52 Appendix 2 Background Questionnaire ...................................................................................... 53 Appendix 3 Post-experiment questionnaire ................................................................................ 55