Angel - a spiritual being believed to act as an attendant, agent, or messenger of God, conventionally represented in human form with wings and a long robe.

Benevolent - (of an organization) serving a charitable rather than a profit-making purpose.
not to be confused with 
Malevolent - having or showing a wish to do evil to others.

Black Eyed Children = strange entities, pale complexion with black eyes, wearing oversized disheveled clothing, appearing and demanding invitation to entry. Do not invite them in nor maintain eye contact. Period. Haunted Road Media discusses the phenomenon here.

Clairaudience - the supposed faculty of perceiving, as if by hearing, what is inaudible.

Clairvoyance - the supposed faculty of perceiving things or events in the future or beyond normal sensory contact.

Demonic - of, resembling, or characteristic of demons or evil entities believed to be from another realm or dimension (in Christianity known as Hell).

Digital Voice Recorder (DVR) - a digital recorder used to pick up ambient sounds and disembodied voices that may be undetectable at the time by the human ear

Dybbuk (Box) - In Jewish mythology, a dybbuk (Yiddish: דיבוק‎, from the Hebrew verb דָּבַק‎ dāḇaq meaning 'adhere' or 'cling') is a malicious possessing spirit believed to be the dislocated soul of a dead person. It supposedly leaves the host body once it has accomplished its goal, sometimes after being helped.[1][2][3]

Empath (Empathic) - (chiefly in science fiction) a person with the paranormal ability to apprehend the mental or emotional state of another individual.

Entity - a thing with distinct and independent existence.

Faeries (the Fae) - reported to be translucent balls or bars of light measuring 2-4 inches in size, resembling fireflies (lightning bugs). One should always be kind and mindful to faeries and make an offering of food or sweet drinks. Haunted Road Media discusses his experience with faeries here. 

Ghost - an apparation of a dead person which is believe to appear or become manifest to the living typically as a nebulous image

Historian - an expert in or student of history, especially that of a particular period, geographical region, or social phenomenon.

K2 Meter - a device used to measure electromagnetic fields in a localized area

Nefarious - (typically of an action or activity) wicked or criminal.

Ouija Board - a board printed with letters, numbers, and other signs, to which a planchette or movable indicator points, supposedly in answer to questions from people at a seance.

Ovilus - ITC (Instrumental Transcendental Communications), digital dowsing, taking digital readings of temperature and electrical fields to convert into words using its' internal dictionary. A very short clip of the ovilus responding by Ghost Adventures.  

Paranormal - denoting events or phenomena such as telekinesis or clairvoyance that are beyond the scope of normal scientific understanding.

Poltergeist - a ghost or other supernatural being supposedly responsible for physical disturbances such as loud noises and objects thrown around.

Spirit - the nonphysical part of a living person regarded as their true self and as capable of surviving physical death or separation.

Shadow Person - appears in different forms, for more inforrmation check out Haunted Road Media defining them in this video and his latest video about the myths and lies concerning dark entities and shadow people.

Voodoo (Vodou) doll - generally (not always) used in black or dark magic rituals to contain a curse or negative entity. Mind Seed TV demonstrates why you should not mess with a voodoo doll.

"White noise works by reducing the difference between background sounds and a “peak” sound, like a door slamming, giving you a better chance to sleep through it undisturbed". (Sleep Foundation). In paranormal investigating white noise is common with the use of the spirit box. Spirits are said to communicate through white noise with electronic frequencies which are heard as words (much like a radio station does).
this involves EVP
Electronic Voice Phenomena - the definition of which is as it reads, the phenomena of hearing voices through electronic devices (spirit box, DVR and ovulus)