IPA: /ˈrɒkə/
KK: /ˈrɑkər/
A person who plays rock music, often associated with a lively and energetic style.
The rocker performed on stage, captivating the audience with his powerful voice.
Rocker → The word is formed from "rock" (from Old English *roccian*, meaning to sway or move back and forth) and the suffix "-er" (meaning a person who). A rocker is a person or thing that rocks or sways.
Think of someone who 'sways' ('rock') back and forth — that's why a rocker is someone who rocks.