Part 2 Lexical development 3. Introduce the topic of lexical development and the factors that contribute to it. Define a) referential words, b) context-bound words, c) over- and d) under-extensions. Identify at at least a) one referential word and b) one over-extension in Luna's sample. Provide and explain examples. 4. Calculate the sample's lexical diversity following the instructions in Lecture 5. Discuss whether there are more nouns, verbs or adjectives in the sample and whether Luna's vocabulary in the sample is varied or repetitive.