IPA: /ˈʃʌt.lər/
KK: /ˈʃʌtlər/
A person who plays badminton, a sport where players hit a shuttlecock back and forth over a net.
The shuttler won the championship after an intense match.
Shuttler is derived from "shuttle" (from Old English *scytel*, meaning a device for weaving) and the suffix "-er" (meaning a person who). A shuttler is a person who operates a shuttle, typically in weaving or transportation contexts.
Think of a 'shuttle' as a device used in weaving, and remember that a 'shuttler' is someone who operates that device.