IPA: /ˈmaɪlər/
KK: /ˈmaɪlər/
A person who competes in races that are one mile long.
The miler trained hard to prepare for the upcoming race.
Miler → It is formed from 'mile' (from Old French *mile*, meaning a unit of distance) and '-er' (meaning a person who). A miler is a person who runs a mile, typically in a race.
Think of someone who runs a specific distance, a 'mile' — and the '-er' just means a person. A miler is someone who runs a mile.