IPA: /ˈsuːpəɡruːp/
KK: /ˈsuːpərɡruːp/
A group of musicians who are all well-known from other bands, often coming together to form a new band, especially in rock music.
The supergroup released their first album last year and it quickly became a hit.
Supergroup → It is formed from "super-" (meaning above or beyond) and "group" (from Old French *groupe*, meaning a collection or assembly). The word "supergroup" refers to a group that is above or beyond a typical group, often implying a larger or more significant assembly.
Think of something that is 'above' ('super-') a regular 'group' — that's why a supergroup is a larger or more significant collection of people or things.
No commonly confused words.