ringer
noun /ˈrɪŋə(r)/
  /ˈrɪŋər/
Idioms - (also bell-ringer)a person who rings church bells as a hobby
 - a device that makes a ringing sound, for example on a phone
- It's easy to adjust the ringer volume.
 
 - a horse or person that takes part in a race illegally, for example by using a false nameTopics Sports: other sportsc2
 
Idioms 
be a dead ringer for somebody 
- (informal) to look very like somebody
- She's a dead ringer for a girl I used to know.