Regarding the difference between synonyms KYOMI and KANSHIN, paying attention to the three points of generality, register distribution, and collocation characteristics, and based on examples that appear in the modern Japanese written word equilibrium corpus (BCCWJ) analyzed. First, the difference in the frequency of use of KYOMI (8,212, 54.8%) and KANSHIN (6,787, 45.2%) extracted from the BCCWJ interface SHONAGON is very weak, and it is remarkable in the degree of generality. There was no difference. On the other hand, in the register, KYOMI is often used mainly in everyday scenes and simple conversational forms, and is not often used in public scenes or revised sentences, whereas KANSHIN is public. There was a tendency that it was used in typical scenes and modified writing styles, but not used in everyday scenes and simple conversational forms. Conjunctive features focus on the semantic differences of co-activators in typical grammatical patterns of “KYOMI-verb” and “KANSHIN-verb”, and KYOMI is unrelated to the will of the subject. it was found that KANSHIN is a rational and willing psychology, while KYOMI is emotionally and accidentally intriguing.