Learning technical terms in Japanese is important, but difficult for international students. Thus, it is important for both instructors and students to determine the vocabulary of terms needed for basic communication in a specialized field. In previous papers, the author showed that characteristic words in physics were efficiently extracted from questions (a high school workbook, National Center Test, EJU, and university entrance examinations). This paper aims to identify important trends in technical terms by analyzing physics lecture audio and then comparing the results with previous studies. It is expected to provide a guide to effective teaching and learning strategies.