A Listening Post is a place where people can observe and listen to what is happening in a certain area. It is usually used for military purposes, such as monitoring enemy activity or gathering intelligence. The term LISTENING POST can be broken down into two words: KEYHOLE (7 letters) and EAR (3 letters). KEYHOLE refers to a small hole used to observe something without being seen, while EAR is a reference to the organ used for hearing.