Learn how to say Supernumerary correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word supernumerary:
exceeding a regular or proper number; extra
functioning as a substitute or assistant with regard to a regular body or staff
a person or thing that exceeds the normal, required, or regular number
a person who functions as a substitute or assistant
an actor who has no lines, esp a nonprofessional one
C17: from Late Latin supernumerārius, from Latin super- + numerus number