predictor vs astrologer

predictor and astrologer both are nouns.

Word	Noun	Adjective	Verb	Adverb
predictor	Yes	No	No	No
astrologer	Yes	No	No	No

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

predictor: someone who makes predictions of the future (usually on the basis of special knowledge)
astrologer: someone who predicts the future by the positions of the planets and sun and Moon

Other hyponyms of predictor include astrologist, fortune teller, fortuneteller.

predictor (noun)	astrologer (noun)
a computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival	someone who predicts the future by the positions of the planets and sun and Moon
information that supports a probabilistic estimate of future events
someone who makes predictions of the future (usually on the basis of special knowledge)