call·er 
/ˈkɑ:lɚ/ noun
plural call·ers /ˈkɑ:lɚ/ noun [count] : a person who calls: such as a : a person who makes a telephone call
▪ The police have received information from an anonymous caller.
b : a person who comes to visit someone
▪ She's had several callers at her house in the past few days.
▪ The police have received information from an anonymous caller.
b : a person who comes to visit someone
▪ She's had several callers at her house in the past few days.
