This is a list of terms that are commonly used in or around the supernatural community. This is not exhaustive, there may be more words I'm not aware of.
Supernatural: Supernaturals are individuals who are associated with or experience the supernatural in some significant way. Common supernaturals include shifters, vampires, and witches.
Psychic: A psychic is a person who can obtain information about the world through supernatural means, such as visions or spirits. Psychics may also be able to affect or manipulate the world through similar supernatural abilities.
Medium: A medium is a person who can summon, converse with or channel spirits.
Shaman: A shaman is a kind of healer, often employing spiritual, mystical or supernatural abilities to help those in their communities. Be careful with who you call a shaman- some tribes and groups have their own terms for individuals stereotypically labeled as shamans, and others may disagree that what they have are shamans by any definition.
Starseed: A starseed is a person who is a reincarnated extraterrestrial put on Earth to help people. (Note that the various 'child' concepts in the starseed community may be a part of autism or mental health denial, and many starseed races push whiteness and supremacist values over other qualities. Not all starseeds support ableism or white supremacy of course, but traverse the community with care.)
Awakening: An awakening is the moment or timeframe when a shifter first finds out that they are a shifter or supernatural.
Shapeshifter (shifter, p-shifter): A shapeshifter is someone who physically (or much less commonly) spiritually transforms into another being. When talking about physical shapeshifters, the term "p-shifter" or "p-shifting" may be used.
Werewolf: A person who assumes a wolf or wolf-like form. Synonyms include lycan, (physical/real) lycanthrope, and wolf shifter.
Shifting: A change in mental, physical, or spiritual state from one form to another. In the shifter community is it often used to refer to physical shifting, spiritual shifting and kinshifts.
Otherkin/Therian/Fictionkin: These are all terms for individiuals who identify non-physically as species or concepts contrary to their physical body. Otherkin identify non-physically as nonhuman beings, therians specifically identify as non-human animals, and fictionkin identify as fictional entities.
Alterhumanity: Alterhumans are those who experience an identity that runs counter to the standard human experience. This includes therians and otherkin, but may also include plurals, furries, spirit channelers, otherhearted and synpaths, and more.
Kinshifting: This is the type of shifting that otherkin and therians practice. These kinds of shifts are not physical, and do not have any sort of physical effect on the world around them.
Species Dysphoria: Species dysphoria is discomfort or unease with one's human species. Many otherkin and therians experience species dysphoria, leading them to seek out shifting communities at one point or another.
Tulpa/Thoughtform: In many supernatural communities, tulpas are energy constructs that can develop their own form of sentience and physicality. In non-supernatural communties, tulpas are sentient imaginary friends or people in plural systems. (Due to confusion with Eastern or supernatural tulpas and concerns about possible cultural appropriation, there is a push for tulpas in plural systems to go by other terminology.)
Reality Shifting: Shifting your mindset to another reality or dimension. May also be known as dimensional jumping.
Crazy Phase: This refers to the phase new supernaturals sometimes go through, where they end up realizing they have all these powers and new abilities and go overboard with them. (Like having large astral battles to save the world, threatening to bite and curse lowly humans who get in their way since they're a powerful nonhuman, etc.) Usually these people calm down as they get used to being different and the novelty wears off.