oneiromancy vs soothsaying

oneiromancy and soothsaying both are nouns.

Word	Noun	Adjective	Verb	Adverb
oneiromancy	Yes	No	No	No
soothsaying	Yes	No	No	No

As nouns, soothsaying is a hypernym of oneiromancy; that is, soothsaying is a word with a broader meaning than oneiromancy:

oneiromancy: divination through the interpretation of dreams
soothsaying: the art or gift of prophecy (or the pretense of prophecy) by supernatural means

Other hypernyms of oneiromancy include divination, foretelling, fortune telling.

oneiromancy (noun)	soothsaying (noun)
divination through the interpretation of dreams	the art or gift of prophecy (or the pretense of prophecy) by supernatural means