IPA: /ˌsuːpəˈnjuːmərəri/
KK: /ˌsuːpərˈnjuməˌrɛri/
More than what is needed or allowed; extra or additional beyond the usual number.
The supernumerary staff helped during the busy season, ensuring everything ran smoothly.
A person or thing that is in addition to the usual number, often referring to an actor who does not have a speaking role but appears in a scene.
The play had several supernumeraries who added to the crowd scene without speaking.
Supernumerary → It is formed from "super-" (meaning above or beyond) and "numerus" (meaning number). The word refers to someone or something that is in addition to the usual number or exceeds the expected count.
Think of 'above' ('super-') the usual 'number' ('numerus') — that's why supernumerary means someone or something that is extra or beyond the normal count.
No commonly confused words.