IPA: /ˈmɛɡəˌstɑːr/
KK: /ˈmɛɡəˌstɑr/
A very famous person, especially in entertainment or sports, who is widely recognized and admired.
The concert was sold out because the megastar was performing.
Megastar → It is formed from "mega-" (from Greek "megas", meaning great or large) and "star" (from Old English "steorra", meaning celestial body). The word "megastar" refers to a star of great prominence or fame, particularly in entertainment.
Think of 'mega' meaning great or large, and 'star' as a celestial body — a megastar is someone who shines brightly in fame.
No commonly confused words.