magician vs telepathist

magician and telepathist both are nouns.

Word	Noun	Adjective	Verb	Adverb
magician	Yes	No	No	No
telepathist	Yes	No	No	No

As nouns, telepathist is a hyponym of magician; that is, telepathist is a word with a more specific, narrower meaning than magician:

magician: someone who performs magic tricks to amuse an audience
telepathist: a magician who seems to discern the thoughts of another person (usually by clever signals from an accomplice)

Other hyponyms of magician include escape expert, escapologist, mind reader, thought-reader.

magician (noun)	telepathist (noun)
one who practices magic or sorcery	someone with the power of communicating thoughts directly
someone who performs magic tricks to amuse an audience	a magician who seems to discern the thoughts of another person (usually by clever signals from an accomplice)