Ed and Lorraine Warren were paranormal investigators who did what type of hunting?
Ghost hunting
Title: The Conjuring (film series)
Passage: The Conjuring is an American horror film series distributed by the New Line Cinema division of Warner Bros.  Pictures.  The films present a fictional take on the real-life cases of Ed and Lorraine Warren, paranormal investigators and authors associated with prominent yet controversial cases of haunting.  The main series follows their attempts to assist people who find themselves possessed by demonic spirits, while the spin-off films focus on the origins of some of the entities the Warrens have come across.
Title: Haunted Collector
Passage: Haunted Collector is an American television reality series which airs on the Syfy cable television channel.  The first season premiered on June 1, 2011, and ended on July 6, 2011.  The series features a team of paranormal investigators led by demonologist John Zaffis, who investigates alleged haunted locations with the hopes of identifying and removing any on-site artifacts or "trigger objects" that may be the source of the supposed paranormal or poltergeist activity.
Title: Ghost hunting
Passage: Ghost hunting is a pseudoscience wherein its adherents visit and investigate locations that are reported to be haunted by ghosts. Typically, a ghost hunting team will attempt to collect "evidence" that they see as supportive of paranormal activity.  Ghost hunters often use a variety of electronic devices: the EMF meter; digital thermometer; handheld and static digital video cameras, such as thermographic (or infrared) and night vision; digital audio recorder; and computer.  Traditional techniques such as conducting interviews and researching the history of a site are also employed.  Some ghost hunters refer to themselves as a "paranormal investigator".
Ghost hunting The Conjuring (film series)