Abstract-What teachers know, believe, and discover about all aspects of their work during the classroom processes have been firmly requested since 1990s as a comprehensive investigation. In addition, vocabulary and the process of its construction according to a specific psycholinguistic model and the procedure of learning is a corresponding familiar topic in relation to teacher cognition. This paper is a case study considering four experienced teachers to recognize whether the process and constant syllabus of teaching vocabulary is interconnected to the materials or to the teacher's prior experience knowledge, beliefs, and culture. Consequently, such research is conducted to verify the assumption of vocabulary teaching as the teachers perceive it, and the influential information which can be practical in teacher education and development programs as well.