These words may or may not be familiar. However, in my line of work they are used everyday. From the perspective of a professional psychic with 10+ years experience, I have distilled a definition for each of these terms. Of course, I have left out thousands of important words, If you have further questions there are many great resources online, contact me to explore deeper.
Astrologer: Someone who reads and interprets astrological charts.
Medium: Someone who believes that they communicate with the deceased.
Psychic: Someone who knows, sees, or hears things, generally invisible to the naked eye or beyond the realm of common perception. This “knowing” may or may not be of a supernatural sort. (May include Retrocognition, Precognition, Clairsentience, Clairaudience, ESP, Dreams, etc.)
Fortune-Teller: Someone who makes claims (publicly) to know the future and predicts based off of their “knowings.” (One is not a fortune-teller unless predictions are shared with others.)
Tarot Card Reader: Someone who reads tarot cards.
Palm Reader: Someone who reads palms.