Kinbakushi 緊縛師
Japanese title for a master of kinbaku, usually shortened to bakushi; like nawashi, it is generally given by others rather than claimed.
Kinbakushi adds shi, “teacher” or “master”, to kinbaku. Wikipedia glosses it as a master of tight binding and notes that the shortened bakushi is more common. Shibari Study defines it as a teacher of kinbaku and treats it as equivalent to nawashi. Andrea Ropes’s glossary adds that it is a title others confer, not one a practitioner gives themselves. The word had public currency in Japan: a Kinbaku Today discussion recalls Akechi Denki appearing on a 1989 television quiz where the answer to “what is your craft” was that he was a kinbakushi. Japanese Wikipedia names kinbakushi as the specialists of rope restraint within SM.