caller / choler / collar [ˈkɑlɜr]
caller – n. – 1. a person who calls, telephones, pays a visit or imitates an animal sound; 2. an announcer
choler – n. – 1. bile; 2. anger
collar – n. & v. – n. – 1. a band attached to clothing and worn; 2. a strip fastened around the rim of a catalogue; 3. a thickly padded horse’s harness; v. 1. seize by the neck or clothing; 2. capture, arrest; 3. attach a rim