This skill is a game for vocabulary building developed in the department of electrical engineering at the Kobe City College of Technology(KCCT for short). First, a definition(or an explanation) of a word is announced as a question, and the user is expected to answer one word after announcing the four words, as four possible choices. Regardless of whether the answer is correct or not, the next definition of a word is announced as a question, and again, the user is expected to answer one word after announcing the four words, as four possible choices. After a certain predetermined number of cycles, the number of correct answers and the number of wrong answers is announced, and the user is asked whether he/she wants to practice the pronunciation of the wrong word(s) or not. Upon choosing the pronunciation practice, the user is asked to pronounce the wrong word after the Alexa's pronunciation. As the questions and answers are carried out by the user's voice interaction, this skill can stimulate a more active learning experience than the conventional answering method by touching the button.