fortune teller vs predictor

fortune teller and predictor both are nouns.

Word	Noun	Adjective	Verb	Adverb
fortune teller	Yes	No	No	No
predictor	Yes	No	No	No

As nouns, predictor is a hypernym of fortune teller; that is, predictor is a word with a broader meaning than fortune teller:

fortune teller: a person who foretells your personal future
predictor: someone who makes predictions of the future (usually on the basis of special knowledge)

Other hypernyms of fortune teller include forecaster, prognosticator, soothsayer.

fortune teller (noun)	predictor (noun)
a person who foretells your personal future	a computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival
	information that supports a probabilistic estimate of future events
	someone who makes predictions of the future (usually on the basis of special knowledge)