astrologer vs soothsayer

astrologer and soothsayer both are nouns.

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

As nouns, soothsayer is a hypernym of astrologer; that is, soothsayer is a word with a broader meaning than astrologer:

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

Other hypernyms of astrologer include forecaster, predictor, prognosticator.

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