A Comparative Study on the Effectiveness of AI Chatbots and Dictionary Apps for Lexical Tasks and Retention

This study compared an AI chatbot (Kimi) and a bilingual dictionary app (NCD) in supporting vocabulary tasks among Chinese junior English majors. Sixty-six participants used either Kimi or NCD to complete both receptive and productive lexical tasks. Questionnaires gathered user feedback on tool use, and a surprise retention test assessed long-term vocabulary retention one week later. Results showed that Kimi significantly outperformed NCD in vocabulary comprehension, collocation production, and productive knowledge retention. Additionally, Kimi demonstrated more consistent performance than NCD across all test items, highlighting its reliability. The study underscores the potential of AI chatbots to address language-related queries and enhance vocabulary acquisition. It also advocates for aligning technological advancements with pedagogical goals to optimize language learning tools and create a sustainable learning environment. Keywords: AI chatbot, dictionary app, vocabulary reception, collocation production, retention