What is another word for knocker?
Pronunciation: [nˈɒkə] (IPA) 
The word "knocker" is typically used to refer to a device on a door that people use to rap their knuckles against in order to signal their arrival or gain entry. However, there are a number of synonyms for this word that can be used in different contexts. For example, a "doorbell" is an electronic device that can be pressed or rung in order to alert residents to the presence of someone outside. Additionally, a "ringer" is another term that is sometimes used to refer to a doorbell or other signal device. Other words that might be used include "buzzer," "chime," and "alarm," depending on the specific context and the way in which the device is being used.
