Koken
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A black-clad person who enters the stage to rearrange the
set
, unremarked by the actors
Word Usage
"There is a position in the organization of the Inoue School called a koken."
Rhyme
Words with the same terminal sound
Broken
broken
misspoken
outspoken
softspoken