Creephole refers to a small hole, crack or opening that allows for secretive or unauthorized observation. There are several synonyms for this word, which include peephole, spyhole, voyeur hole, pinhole, and secret hole. A peephole is a small opening that allows one to observe what is on the other side without being detected. An individual who uses a spyhole may be trying to gather information without the knowledge of the other party. A voyeur hole could be created to observe a person's activities without their consent. Pinhole and secret hole are both discrete openings that could be used for observation or as a means of escape.