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The appropriate topic for Ty's research on word understanding and categorically related words is psycholinguistics. This field specifically focuses on the interplay between language and cognitive processes, including how individuals comprehend, produce, and acquire language. Since Ty's research appears to delve into understanding how words are categorized and processed cognitively, it falls squarely within the realm of psycholinguistics, which examines the mental representations and processes related to language comprehension.

Cognitive psychology broadly studies mental processes, including perception, memory, and problem-solving, but it's less specific to language than psycholinguistics. Behavioral psychology emphasizes observable behaviors rather than internal cognitive processes related to language understanding. Neuroscience studies the brain's structure and function, including how it relates to behavior, but it doesn't specifically target language and word categorization in a cognitive context. Thus, psycholinguistics is the most fitting context for Ty's work.