Current research and practices in teacher education have focused on concepts such as professionalism, professionality, skills, capacity, ability, competency, or competence. However, these terms, especially professionalism and competence (or competencies), appear to be used interchangeably in different research studies, which means that it becomes difficult not only to compare these concepts among various studies, but also to identify their relevant implications. For example, what kind of “professionalism” components are newly required today? What level of excellence is needed in each professionalism component? How can we define the field and extent of professionalism? How are these ideas expressed in the Japanese government’s teacher education policies? Finally, how can the interrelations between the contents of professionalism and competence (competencies) be clarified in the concept of professionalism? Thus, this study aims to describe how teacher education research and practices use the words “professionalism” and “competence,” and tries to clarify their relationship to other familiar terms so that an overview of the current status of teacher education studies and practices becomes easier and clearer.