shusher

/ˈʃʌʃər/
noun
  1. A person who tells others to be quiet, especially in a public place.
    • My dad is the family shusher whenever we watch a movie together.
    • During the concert, a shusher behind us kept telling people to stop talking.
    • The old man was a notorious shusher at the library.
Synonyms
What does "shusher" mean? | whatsthatwordmean | whatsthatwordmean