A "crank caller" is someone who makes prank or harassing phone calls. There are many synonyms for this term, including nuisance caller, hoax caller, prankster, jokester, and troublemaker. Other terms used to describe these types of callers may include phone harasser, annoying caller, or even stalker, depending on the severity of the calls and the level of distress they cause. Regardless of the specific term used, these individuals often disrupt the peace and privacy of those who receive their calls, and may even be subject to legal consequences if their behavior crosses certain lines.